Cleaned data and setting up environment with dataset

#set whatever directory you have your data in
setwd("/Users/raphaelchevallier/Documents/DATA311/DATA311Project")
data = read.csv("Cost_of_living_index.csv", header = TRUE)
attach(data)
data
##     Rank                                  City Cost.of.Living.Index
## 1      1                     Hamilton, Bermuda               137.56
## 2      2                   Zurich, Switzerland               128.65
## 3      3                    Basel, Switzerland               126.89
## 4      4                 Lausanne, Switzerland               119.62
## 5      5                     Bern, Switzerland               118.42
## 6      6                   Geneva, Switzerland               118.33
## 7      7                    Reykjavik, Iceland               112.57
## 8      8                   Lugano, Switzerland               111.88
## 9      9                     Stavanger, Norway               111.00
## 10    10                          Oslo, Norway               107.14
## 11    11                        Bergen, Norway               102.87
## 12    12           New York, NY, United States               100.00
## 13    13                     Trondheim, Norway                99.73
## 14    14      San Francisco, CA, United States                96.88
## 15    15           Honolulu, HI, United States                93.72
## 16    16          Anchorage, AK, United States                93.19
## 17    17           Brooklyn, NY, United States                90.31
## 18    18         Washington, DC, United States                88.50
## 19    19         Santa Rosa, CA, United States                88.27
## 20    20                   Copenhagen, Denmark                87.91
## 21    21         Charleston, SC, United States                86.87
## 22    22                Luxembourg, Luxembourg                86.85
## 23    23           Bellevue, WA, United States                85.97
## 24    24            Seattle, WA, United States                85.51
## 25    25                          Tokyo, Japan                84.78
## 26    26                         Paris, France                84.68
## 27    27                       Odense, Denmark                84.09
## 28    28           Berkeley, CA, United States                84.09
## 29    29        Jersey City, NJ, United States                84.08
## 30    30                      Aalborg, Denmark                82.21
## 31    31                Amsterdam, Netherlands                82.14
## 32    32                    Seoul, South Korea                81.96
## 33    33                        Arhus, Denmark                81.94
## 34    34                London, United Kingdom                81.31
## 35    35            Oakland, CA, United States                81.18
## 36    36                     Helsinki, Finland                80.60
## 37    37             Boston, MA, United States                80.46
## 38    38                  Singapore, Singapore                80.40
## 39    39                       Dublin, Ireland                80.28
## 40    40                     Sydney, Australia                79.93
## 41    41           Hartford, CT, United States                79.85
## 42    42             Albany, NY, United States                79.38
## 43    43       Philadelphia, PA, United States                79.25
## 44    44                      Tampere, Finland                79.04
## 45    45         Milton Keynes, United Kingdom                78.50
## 46    46                      Grenoble, France                78.43
## 47    47             Irvine, CA, United States                78.38
## 48    48                          Lyon, France                78.00
## 49    49         Long Beach, CA, United States                77.95
## 50    50                         Linz, Austria                77.80
## 51    51        Los Angeles, CA, United States                77.66
## 52    52                 Tel Aviv-Yafo, Israel                77.39
## 53    53                        Barrie, Canada                77.37
## 54    54            Chicago, IL, United States                77.33
## 55    55                     Stockholm, Sweden                77.23
## 56    56                       Florence, Italy                77.21
## 57    57            Boulder, CO, United States                77.16
## 58    58     The Hague (Den Haag), Netherlands                76.75
## 59    59               Reading, United Kingdom                76.73
## 60    60                 Auckland, New Zealand                76.63
## 61    61                     Jerusalem, Israel                76.62
## 62    62                      Bordeaux, France                76.31
## 63    63                  Utrecht, Netherlands                76.30
## 64    64                      Toulouse, France                76.30
## 65    65           San Jose, CA, United States                76.28
## 66    66         Burlington, VT, United States                76.11
## 67    67         Pittsburgh, PA, United States                76.04
## 68    68                          Nice, France                75.84
## 69    69              Miami, FL, United States                75.83
## 70    70                     Brussels, Belgium                75.69
## 71    71                         Graz, Austria                75.61
## 72    72      Santa Barbara, CA, United States                75.55
## 73    73         Sacramento, CA, United States                75.54
## 74    74                    Strasbourg, France                75.47
## 75    75                          Genoa, Italy                75.38
## 76    76                         Gent, Belgium                75.27
## 77    77                      Perth, Australia                75.09
## 78    78                      Antwerp, Belgium                74.88
## 79    79           Portland, ME, United States                74.81
## 80    80    West Palm Beach, FL, United States                74.79
## 81    81                  Hong Kong, Hong Kong                74.73
## 82    82                    Innsbruck, Austria                74.66
## 83    83                       Leuven, Belgium                74.58
## 84    84                   Leiden, Netherlands                74.56
## 85    85                          Osaka, Japan                74.53
## 86    86                  Melbourne, Australia                74.53
## 87    87                  Bath, United Kingdom                74.48
## 88    88            Everett, WA, United States                74.36
## 89    89                     Saskatoon, Canada                74.26
## 90    90             Tacoma, WA, United States                74.21
## 91    91           Portland, OR, United States                74.17
## 92    92                Rotterdam, Netherlands                74.08
## 93    93                   Montpellier, France                74.08
## 94    94                St. John's, NL, Canada                74.05
## 95    95                          Milan, Italy                73.89
## 96    96               Maastricht, Netherlands                73.87
## 97    97          Baltimore, MD, United States                73.85
## 98    98                       Munich, Germany                73.79
## 99    99                        Espoo, Finland                73.78
## 100  100        New Orleans, LA, United States                73.61
## 101  101                       Galway, Ireland                73.54
## 102  102                         Cork, Ireland                73.53
## 103  103                         Padova, Italy                73.49
## 104  104                         Haifa, Israel                73.42
## 105  105          Charlotte, NC, United States                73.33
## 106  106                    Burlington, Canada                73.13
## 107  107              Aberdeen, United Kingdom                73.02
## 108  108                   Dusseldorf, Germany                73.00
## 109  109        Minneapolis, MN, United States                72.93
## 110  110                   Adelaide, Australia                72.92
## 111  111                Eindhoven, Netherlands                72.82
## 112  112             Cambridge, United Kingdom                72.60
## 113  113                Oxford, United Kingdom                72.60
## 114  114                     Darwin, Australia                72.47
## 115  115             Eugene, OR, United States                72.46
## 116  116                        Nantes, France                72.37
## 117  117                Groningen, Netherlands                72.29
## 118  118          San Diego, CA, United States                72.29
## 119  119                     Ramat Gan, Israel                72.15
## 120  120                      Hamburg, Germany                72.15
## 121  121         Bellingham, WA, United States                72.14
## 122  122            Atlanta, GA, United States                72.05
## 123  123             Denver, CO, United States                72.02
## 124  124         Saint Paul, MN, United States                71.94
## 125  125                 Hamilton, New Zealand                71.91
## 126  126         Birmingham, AL, United States                71.87
## 127  127                    Frankfurt, Germany                71.64
## 128  128               Wellington, New Zealand                71.52
## 129  129          Asheville, NC, United States                71.52
## 130  130                        Trieste, Italy                71.51
## 131  131         Fort Myers, FL, United States                71.50
## 132  132                  Newcastle, Australia                71.42
## 133  133            Portsmouth, United Kingdom                71.04
## 134  134                       Halifax, Canada                70.88
## 135  135                       Vienna, Austria                70.86
## 136  136                   Heidelberg, Germany                70.82
## 137  137       Indianapolis, IN, United States                70.79
## 138  138             Edinburgh, United Kingdom                70.73
## 139  139       Jacksonville, FL, United States                70.62
## 140  140            Buffalo, NY, United States                70.59
## 141  141            Olympia, WA, United States                70.57
## 142  142   Saint Petersburg, FL, United States                70.49
## 143  143             Austin, TX, United States                70.49
## 144  144                   Brisbane, Australia                70.46
## 145  145                        Male, Maldives                70.45
## 146  146                         Sliema, Malta                70.33
## 147  147          Rochester, NY, United States                70.25
## 148  148             Christchurch, New Zealand                70.23
## 149  149                       Toronto, Canada                70.19
## 150  150            Orlando, FL, United States                70.18
## 151  151                  Dunedin, New Zealand                70.16
## 152  152                        Turku, Finland                70.13
## 153  153              Plymouth, United Kingdom                70.02
## 154  154               Swindon, United Kingdom                69.92
## 155  155                   Canberra, Australia                69.88
## 156  156            Manchester, United Kingdom                69.86
## 157  157             Peoria, IL, United States                69.84
## 158  158                    Gothenburg, Sweden                69.77
## 159  159          Cleveland, OH, United States                69.65
## 160  160                     Vancouver, Canada                69.63
## 161  161                     Limerick, Ireland                69.63
## 162  162               Bristol, United Kingdom                69.58
## 163  163              Brighton, United Kingdom                69.54
## 164  164                        Bologna, Italy                69.50
## 165  165                  York, United Kingdom                69.33
## 166  166                    Karlsruhe, Germany                69.26
## 167  167            Raleigh, NC, United States                69.18
## 168  168                         Bonn, Germany                69.14
## 169  169                     Hobart, Australia                69.10
## 170  170          Arlington, TX, United States                69.07
## 171  171                           Rome, Italy                69.03
## 172  172        Saint Louis, MO, United States                69.02
## 173  173                       Bremen, Germany                68.93
## 174  174                       Calgary, Canada                68.93
## 175  175          Milwaukee, WI, United States                68.81
## 176  176                      Brampton, Canada                68.79
## 177  177          Nashville, TN, United States                68.78
## 178  178                       Uppsala, Sweden                68.75
## 179  179              Tampa, FL, United States                68.61
## 180  180                        Regina, Canada                68.46
## 181  181                     Mannheim, Germany                68.35
## 182  182                 Leeds, United Kingdom                68.26
## 183  183     Virginia Beach, VA, United States                67.86
## 184  184                       Berlin, Germany                67.75
## 185  185                         Lille, France                67.73
## 186  186           Syracuse, NY, United States                67.55
## 187  187                    Stuttgart, Germany                67.46
## 188  188                     Coquitlam, Canada                67.43
## 189  189                      Red Deer, Canada                67.42
## 190  190                      Cologne, Germany                67.36
## 191  191                       Aachen, Germany                67.33
## 192  192        Tallahassee, FL, United States                67.24
## 193  193        Bakersfield, CA, United States                67.11
## 194  194          Ann Arbor, MI, United States                67.06
## 195  195            Nottingham, United Kingdom                67.05
## 196  196                      Edmonton, Canada                67.03
## 197  197          Las Vegas, NV, United States                66.98
## 198  198           Columbus, OH, United States                66.90
## 199  199                          Turin, Italy                66.68
## 200  200            Spokane, WA, United States                66.60
## 201  201                       Kelowna, Canada                66.60
## 202  202                Exeter, United Kingdom                66.56
## 203  203               Glasgow, United Kingdom                66.50
## 204  204            Memphis, TN, United States                66.49
## 205  205                      Kingston, Canada                66.45
## 206  206                    Nuremberg, Germany                66.44
## 207  207              Coventry, United Kingdom                66.31
## 208  208           Columbia, SC, United States                66.23
## 209  209                      Victoria, Canada                66.17
## 210  210                         Malmo, Sweden                66.14
## 211  211              Salem, OR, United States                66.04
## 212  212                      Leipzig, Germany                66.04
## 213  213                      Dresden, Germany                65.92
## 214  214         Fort Wayne, IN, United States                65.88
## 215  215             Dayton, OH, United States                65.84
## 216  216                 San Juan, Puerto Rico                65.79
## 217  217                        Taipei, Taiwan                65.75
## 218  218        Kansas City, MO, United States                65.74
## 219  219             Leicester, United Kingdom                65.59
## 220  220                        Oshawa, Canada                65.44
## 221  221                   Nanaimo, BC, Canada                65.28
## 222  222         Fort Worth, TX, United States                65.19
## 223  223              Palma de Mallorca, Spain                65.17
## 224  224                   Mississauga, Canada                65.08
## 225  225                   Quebec City, Canada                65.07
## 226  226               Norwich, United Kingdom                64.95
## 227  227                       Burnaby, Canada                64.94
## 228  228       Fayetteville, AR, United States                64.84
## 229  229                         Naples, Italy                64.82
## 230  230                 Derby, United Kingdom                64.70
## 231  231                     Marseille, France                64.64
## 232  232                     Kingston, Jamaica                64.59
## 233  233                      Hanover, Germany                64.57
## 234  234           Richmond, VA, United States                64.56
## 235  235                 Gold Coast, Australia                64.53
## 236  236         Greensboro, NC, United States                64.46
## 237  237            Birmingham, United Kingdom                64.46
## 238  238                       Windsor, Canada                64.42
## 239  239             Dallas, TX, United States                64.32
## 240  240        Albuquerque, NM, United States                64.32
## 241  241            Phoenix, AZ, United States                64.31
## 242  242           Southampton, United Kingdom                63.73
## 243  243        Gainesville, FL, United States                63.62
## 244  244                      Montreal, Canada                63.52
## 245  245       Grand Rapids, MI, United States                63.47
## 246  246             Tucson, AZ, United States                63.35
## 247  247            Madison, WI, United States                63.30
## 248  248        Chattanooga, TN, United States                63.28
## 249  249             Fresno, CA, United States                63.25
## 250  250            Wichita, KS, United States                63.18
## 251  251                      Winnipeg, Canada                63.15
## 252  252                       Cagliari, Italy                63.15
## 253  253     Salt Lake City, UT, United States                62.94
## 254  254                        Ottawa, Canada                62.88
## 255  255                           Doha, Qatar                62.81
## 256  256            Detroit, MI, United States                62.77
## 257  257   Newcastle upon Tyne, United Kingdom                62.76
## 258  258              Tulsa, OK, United States                62.67
## 259  259         Cincinnati, OH, United States                62.65
## 260  260             Sheffield, United Kingdom                62.64
## 261  261               Belfast, United Kingdom                62.42
## 262  262            Lubbock, TX, United States                62.40
## 263  263                      Taichung, Taiwan                62.23
## 264  264         Des Moines, IA, United States                62.21
## 265  265            Houston, TX, United States                62.16
## 266  266                      Barcelona, Spain                62.15
## 267  267               Cardiff, United Kingdom                62.12
## 268  268             Liverpool, United Kingdom                62.00
## 269  269       Abu Dhabi, United Arab Emirates                61.94
## 270  270      Oklahoma City, OK, United States                61.72
## 271  271                        Palermo, Italy                61.16
## 272  272                       Moncton, Canada                61.15
## 273  273                       Nicosia, Cyprus                60.97
## 274  274          Knoxville, TN, United States                60.97
## 275  275                       Beirut, Lebanon                60.79
## 276  276                      Hamilton, Canada                60.75
## 277  277        Springfield, MO, United States                60.56
## 278  278          Vancouver, WA, United States                60.46
## 279  279                        Athens, Greece                60.44
## 280  280             Toledo, OH, United States                60.35
## 281  281        Little Rock, AR, United States                60.31
## 282  282         Louisville, KY, United States                60.24
## 283  283                         Madrid, Spain                60.12
## 284  284               Reno, NV, United States                59.84
## 285  285         Huntsville, AL, United States                59.80
## 286  286          Lexington, KY, United States                59.64
## 287  287    Port of Spain, Trinidad And Tobago                59.60
## 288  288              Boise, ID, United States                59.43
## 289  289            El Paso, TX, United States                59.37
## 290  290                        Surrey, Canada                59.18
## 291  291                        London, Canada                59.15
## 292  292                    Abbotsford, Canada                58.95
## 293  293                     Kitchener, Canada                58.93
## 294  294        San Antonio, TX, United States                58.12
## 295  295                   Montevideo, Uruguay                58.05
## 296  296           Zaragoza (Saragossa), Spain                58.00
## 297  297                  Thessaloniki, Greece                57.97
## 298  298                  San Jose, Costa Rica                57.84
## 299  299                      Limassol, Cyprus                57.71
## 300  300                          Accra, Ghana                57.23
## 301  301                     Kaohsiung, Taiwan                56.44
## 302  302                   Ljubljana, Slovenia                56.34
## 303  303                       Valencia, Spain                55.27
## 304  304                       Manama, Bahrain                55.23
## 305  305                      Tallinn, Estonia                55.23
## 306  306                   Panama City, Panama                54.91
## 307  307                         Amman, Jordan                54.72
## 308  308              Seville (Sevilla), Spain                54.70
## 309  309                       Larnaca, Cyprus                54.31
## 310  310                      Lisbon, Portugal                54.16
## 311  311                       Alicante, Spain                53.90
## 312  312                        Split, Croatia                53.62
## 313  313                     Bangkok, Thailand                53.61
## 314  314         Sharjah, United Arab Emirates                53.45
## 315  315           Dubai, United Arab Emirates                53.32
## 316  316                       Rijeka, Croatia                52.96
## 317  317                       Zagreb, Croatia                52.20
## 318  318                   Makati, Philippines                51.07
## 319  319                     Coimbra, Portugal                51.07
## 320  320                          Muscat, Oman                51.04
## 321  321               Al Khobar, Saudi Arabia                51.03
## 322  322                     Funchal, Portugal                50.90
## 323  323                          Riga, Latvia                50.82
## 324  324                       Porto, Portugal                50.43
## 325  325                       Shanghai, China                50.41
## 326  326                        Granada, Spain                50.41
## 327  327                         Malaga, Spain                50.38
## 328  328                       Santiago, Chile                50.37
## 329  329         Jeddah (Jiddah), Saudi Arabia                49.99
## 330  330                 Addis Ababa, Ethiopia                49.96
## 331  331                        Tartu, Estonia                49.65
## 332  332                          Havana, Cuba                49.52
## 333  333                        Quito, Ecuador                49.42
## 334  334                     Maribor, Slovenia                49.30
## 335  335         Santa Cruz de Tenerife, Spain                48.69
## 336  336                  Riyadh, Saudi Arabia                48.68
## 337  337                  Bratislava, Slovakia                48.64
## 338  338                       Braga, Portugal                48.55
## 339  339               Ad Dammam, Saudi Arabia                48.43
## 340  340                    Vilnius, Lithuania                48.31
## 341  341                Prague, Czech Republic                48.02
## 342  342           Bandar Seri Begawan, Brunei                48.01
## 343  343                      Harare, Zimbabwe                47.78
## 344  344     Las Palmas de Gran Canaria, Spain                47.39
## 345  345             San Salvador, El Salvador                47.22
## 346  346                    Guayaquil, Ecuador                47.21
## 347  347                         Baghdad, Iraq                47.17
## 348  348                      Phuket, Thailand                46.98
## 349  349                   Klaipeda, Lithuania                46.98
## 350  350                      Kosice, Slovakia                46.27
## 351  351                Pretoria, South Africa                45.89
## 352  352     Santo Domingo, Dominican Republic                45.88
## 353  353                     Kaunas, Lithuania                45.88
## 354  354                     Windhoek, Namibia                45.84
## 355  355                  Phnom Penh, Cambodia                45.67
## 356  356            Johannesburg, South Africa                45.51
## 357  357                       Osijek, Croatia                44.95
## 358  358                  Brno, Czech Republic                44.59
## 359  359                        Moscow, Russia                44.54
## 360  360                    Selangor, Malaysia                44.53
## 361  361                      Campinas, Brazil                44.45
## 362  362             Guatemala City, Guatemala                44.39
## 363  363               Dar es Salaam, Tanzania                44.33
## 364  364               Petaling Jaya, Malaysia                44.31
## 365  365                     Sao Paulo, Brazil                44.16
## 366  366                Rio de Janeiro, Brazil                44.12
## 367  367                      Brasilia, Brazil                44.02
## 368  368                      Penang, Malaysia                43.98
## 369  369                        Beijing, China                43.88
## 370  370                     Budapest, Hungary                43.74
## 371  371                        Gdansk, Poland                42.82
## 372  372                 Johor Bahru, Malaysia                42.59
## 373  373                     Pattaya, Thailand                42.53
## 374  374                           Irbil, Iraq                42.51
## 375  375                Kuala Lumpur, Malaysia                42.44
## 376  376                        Warsaw, Poland                42.32
## 377  377                       Shenzhen, China                42.21
## 378  378                     Kuching, Malaysia                42.15
## 379  379               Kota Kinabalu, Malaysia                42.15
## 380  380          Peterborough, United Kingdom                41.93
## 381  381                        Nairobi, Kenya                41.76
## 382  382                    Jakarta, Indonesia                41.60
## 383  383               Cape Town, South Africa                41.58
## 384  384                       Bali, Indonesia                41.48
## 385  385                            Lima, Peru                41.47
## 386  386               Olomouc, Czech Republic                41.27
## 387  387                        Gdynia, Poland                41.22
## 388  388                        Recife, Brazil                40.67
## 389  389                  Porto Alegre, Brazil                40.56
## 390  390               Ostrava, Czech Republic                40.55
## 391  391                  Chiang Mai, Thailand                40.53
## 392  392                Belo Horizonte, Brazil                40.48
## 393  393                  Durban, South Africa                40.48
## 394  394                    Bucharest, Romania                40.39
## 395  395                       Sofia, Bulgaria                40.36
## 396  396                      Guangzhou, China                40.29
## 397  397                 Florianopolis, Brazil                40.26
## 398  398                      Belgrade, Serbia                40.10
## 399  399                       Wroclaw, Poland                40.00
## 400  400                 Podgorica, Montenegro                39.83
## 401  401               Krakow (Cracow), Poland                39.53
## 402  402          Port Elizabeth, South Africa                39.41
## 403  403              Saint Petersburg, Russia                39.25
## 404  404      Sarajevo, Bosnia And Herzegovina                39.25
## 405  405                       Varna, Bulgaria                39.13
## 406  406                        Poznan, Poland                38.99
## 407  407                    Constanta, Romania                38.89
## 408  408                        Rabat, Morocco                38.59
## 409  409               Buenos Aires, Argentina                38.57
## 410  410                     Bydgoszcz, Poland                38.54
## 411  411                       Szeged, Hungary                38.41
## 412  412                        Hanoi, Vietnam                38.34
## 413  413                      Curitiba, Brazil                38.34
## 414  414                    Timisoara, Romania                38.19
## 415  415                  Cluj-Napoca, Romania                38.13
## 416  416                     Debrecen, Hungary                38.05
## 417  417                         Suzhou, China                37.95
## 418  418                   Manila, Philippines                37.95
## 419  419                      Istanbul, Turkey                37.85
## 420  420             Ho Chi Minh City, Vietnam                37.82
## 421  421                      Katowice, Poland                37.48
## 422  422                      Szczecin, Poland                37.35
## 423  423                   Chelyabinsk, Russia                37.29
## 424  424                       Tirana, Albania                37.25
## 425  425                          Lodz, Poland                37.13
## 426  426                       Brasov, Romania                37.13
## 427  427    Banja Luka, Bosnia And Herzegovina                36.54
## 428  428                         Iasi, Romania                36.54
## 429  429                     Plovdiv, Bulgaria                36.45
## 430  430                     Cebu, Philippines                36.41
## 431  431                 Yekaterinburg, Russia                36.41
## 432  432                      Burgas, Bulgaria                36.26
## 433  433                        Chengdu, China                36.16
## 434  434                       Cuenca, Ecuador                36.13
## 435  435                        Lublin, Poland                36.12
## 436  436                    Colombo, Sri Lanka                36.00
## 437  437                        Samara, Russia                35.96
## 438  438                         Arad, Romania                35.84
## 439  439                   Surabaya, Indonesia                35.72
## 440  440                   Casablanca, Morocco                35.68
## 441  441                        Sibiu, Romania                35.63
## 442  442                    Bandung, Indonesia                35.58
## 443  443                  Paramaribo, Suriname                35.45
## 444  444                   Kaliningrad, Russia                35.40
## 445  445                      Novi Sad, Serbia                35.36
## 446  446                      Bogota, Colombia                35.05
## 447  447                 Yogyakarta, Indonesia                34.91
## 448  448                    Astana, Kazakhstan                34.90
## 449  449                        Ankara, Turkey                34.77
## 450  450                     Skopje, Macedonia                34.68
## 451  451                       Oradea, Romania                34.35
## 452  452                           Nis, Serbia                34.20
## 453  453                          Tehran, Iran                34.19
## 454  454                   Mexico City, Mexico                34.18
## 455  455                 Ulaanbaatar, Mongolia                34.16
## 456  456                     Monterrey, Mexico                34.12
## 457  457                        Minsk, Belarus                34.07
## 458  458               Nizhny Novgorod, Russia                34.04
## 459  459                Barranquilla, Colombia                34.04
## 460  460                         Izmir, Turkey                34.03
## 461  461                    Medellin, Colombia                33.82
## 462  462                       Antalya, Turkey                33.78
## 463  463                     Chisinau, Moldova                33.75
## 464  464                         Bursa, Turkey                33.72
## 465  465                         Kazan, Russia                33.67
## 466  466                   Novosibirsk, Russia                33.65
## 467  467                    Davao, Philippines                33.57
## 468  468                    Asuncion, Paraguay                33.49
## 469  469                      Algiers, Algeria                33.44
## 470  470                        Lagos, Nigeria                33.33
## 471  471                Dumaguete, Philippines                33.21
## 472  472                      Yerevan, Armenia                33.16
## 473  473                       Tijuana, Mexico                32.70
## 474  474                    Almaty, Kazakhstan                32.51
## 475  475                Rostov-na-donu, Russia                32.40
## 476  476                     Krasnodar, Russia                32.37
## 477  477                      Kathmandu, Nepal                31.89
## 478  478                      Craiova, Romania                31.78
## 479  479                      Voronezh, Russia                31.74
## 480  480              Quezon City, Philippines                31.66
## 481  481                     Dhaka, Bangladesh                31.57
## 482  482                       Kampala, Uganda                31.51
## 483  483                   Guadalajara, Mexico                31.46
## 484  484                        Cancun, Mexico                31.35
## 485  485                     Queretaro, Mexico                31.01
## 486  486                        Gurgaon, India                30.71
## 487  487                        Cali, Colombia                30.48
## 488  488                      Tbilisi, Georgia                30.22
## 489  489                       Odessa, Ukraine                30.13
## 490  490                  Tashkent, Uzbekistan                29.94
## 491  491               Puerto Vallarta, Mexico                29.82
## 492  492                         Kiev, Ukraine                29.42
## 493  493                      Baku, Azerbaijan                29.41
## 494  494                        Merida, Mexico                29.39
## 495  495                         Mumbai, India                29.03
## 496  496                        Puebla, Mexico                28.89
## 497  497                          Delhi, India                28.67
## 498  498                          Noida, India                28.55
## 499  499                       Dnipro, Ukraine                27.96
## 500  500                    Caracas, Venezuela                27.82
## 501  501                           Pune, India                27.41
## 502  502                         Lviv, Ukraine                27.24
## 503  503                       Ludhiana, India                27.17
## 504  504                      Bangalore, India                26.83
## 505  505                      Kharkiv, Ukraine                26.71
## 506  506                        Tunis, Tunisia                26.53
## 507  507 Pristina, Kosovo (Disputed Territory)                26.24
## 508  508                     Chandigarh, India                26.00
## 509  509                   Islamabad, Pakistan                25.86
## 510  510                      Lahore, Pakistan                25.83
## 511  511                          Cairo, Egypt                25.68
## 512  512                         Jaipur, India                25.46
## 513  513                         Indore, India                25.40
## 514  514                          Thane, India                25.31
## 515  515                        Chennai, India                25.20
## 516  516                        Kolkata, India                24.80
## 517  517              Lucknow (Lakhnau), India                24.75
## 518  518                            Goa, India                24.34
## 519  519                      Ahmedabad, India                24.24
## 520  520                     Alexandria, Egypt                23.92
## 521  521                     Karachi, Pakistan                23.90
## 522  522                         Sumy, Ukraine                23.84
## 523  523                          Surat, India                23.77
## 524  524                      Hyderabad, India                23.59
## 525  525                         Nagpur, India                22.76
## 526  526                       Guwahati, India                22.68
## 527  527                         Mysore, India                22.41
## 528  528                    Bhubaneswar, India                22.40
## 529  529                      Mangalore, India                22.40
## 530  530                     Coimbatore, India                22.38
## 531  531                         Bhopal, India                22.37
## 532  532                       Vadodara, India                22.28
## 533  533                          Kochi, India                21.73
## 534  534                  Visakhapatnam, India                21.52
## 535  535                    Navi Mumbai, India                19.30
## 536  536             Thiruvananthapuram, India                19.26
##     Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 1       103.03                         121.21          126.56
## 2        62.62                          97.39          127.35
## 3        46.14                          88.66          120.44
## 4        50.35                          86.83          116.35
## 5        39.22                          80.93          114.54
## 6        69.16                          95.06          112.08
## 7        57.40                          86.45           98.53
## 8        49.58                          82.39          104.85
## 9        38.85                          76.85           95.97
## 10       48.58                          79.42           93.81
## 11       39.38                          72.82           87.02
## 12      100.00                         100.00          100.00
## 13       39.87                          71.39           82.31
## 14      106.49                         101.43          101.93
## 15       63.96                          79.63           96.32
## 16       39.45                          67.75           96.74
## 17       81.02                          85.91           83.16
## 18       70.28                          79.87           86.63
## 19       56.69                          73.32           84.35
## 20       47.84                          68.94           64.59
## 21       46.12                          67.58           90.86
## 22       61.31                          74.76           70.75
## 23       61.20                          74.24           78.24
## 24       64.70                          75.66           83.72
## 25       36.41                          61.89           81.72
## 26       47.60                          67.13           73.77
## 27       23.31                          55.32           65.29
## 28       76.39                          80.45           81.99
## 29       61.58                          73.43           86.08
## 30       24.92                          55.09           62.32
## 31       54.65                          69.13           62.35
## 32       33.01                          58.79           93.57
## 33       31.71                          58.16           61.47
## 34       70.30                          76.10           57.74
## 35       77.14                          79.27           77.54
## 36       35.69                          59.34           61.31
## 37       76.09                          78.39           75.71
## 38       60.38                          70.92           66.82
## 39       60.12                          70.73           60.82
## 40       62.58                          71.72           68.63
## 41       41.58                          61.73           83.41
## 42       31.01                          56.48           77.50
## 43       49.35                          65.10           74.58
## 44       26.21                          54.03           68.46
## 45       34.45                          57.65           71.63
## 46       23.34                          52.35           73.56
## 47       65.75                          72.40           73.87
## 48       27.34                          54.02           69.55
## 49       55.18                          67.17           74.93
## 50       26.66                          53.59           67.39
## 51       70.45                          74.25           71.59
## 52       40.57                          59.96           62.34
## 53       29.08                          54.51           73.87
## 54       55.53                          67.01           70.69
## 55       40.18                          59.69           64.74
## 56       29.07                          54.42           63.10
## 57       53.54                          65.98           76.79
## 58       35.79                          57.36           58.82
## 59       39.11                          58.92           63.73
## 60       42.90                          60.67           66.39
## 61       34.34                          56.60           60.65
## 62       26.10                          52.54           67.34
## 63       37.46                          57.92           58.34
## 64       23.03                          51.09           66.45
## 65       76.61                          76.43           71.10
## 66       41.81                          59.87           73.17
## 67       38.23                          58.15           71.89
## 68       29.77                          54.03           69.04
## 69       57.81                          67.30           67.27
## 70       32.03                          55.02           63.45
## 71       23.23                          50.82           71.92
## 72       68.66                          72.29           67.52
## 73       44.29                          60.75           69.09
## 74       23.02                          50.64           65.79
## 75       20.01                          49.17           63.25
## 76       25.78                          51.85           57.88
## 77       33.44                          55.38           65.24
## 78       25.38                          51.45           61.20
## 79       42.40                          59.47           72.45
## 80       42.16                          59.34           70.55
## 81       78.33                          76.44           74.88
## 82       30.67                          53.84           61.87
## 83       28.04                          52.55           59.51
## 84       33.80                          55.26           56.34
## 85       22.37                          49.84           68.32
## 86       42.73                          59.48           67.10
## 87       34.60                          55.60           61.79
## 88       43.44                          59.72           72.61
## 89       26.16                          51.49           72.37
## 90       38.62                          57.36           71.42
## 91       50.67                          63.05           69.19
## 92       33.42                          54.83           53.99
## 93       24.82                          50.76           62.71
## 94       21.80                          49.32           70.28
## 95       39.56                          57.63           59.19
## 96       32.10                          54.10           59.93
## 97       42.89                          59.20           68.71
## 98       45.18                          60.25           56.28
## 99       31.47                          53.75           58.58
## 100      41.21                          58.27           67.00
## 101      34.02                          54.83           61.77
## 102      37.58                          56.51           57.77
## 103      21.74                          48.99           60.51
## 104      19.47                          47.88           55.23
## 105      41.65                          58.33           69.21
## 106      32.42                          53.86           64.86
## 107      27.95                          51.69           57.21
## 108      32.84                          53.99           53.33
## 109      46.18                          60.27           68.29
## 110      31.99                          53.54           67.23
## 111      34.10                          54.49           56.19
## 112      43.84                          58.99           54.62
## 113      48.82                          61.34           51.41
## 114      35.59                          55.01           64.71
## 115      30.44                          52.57           78.36
## 116      21.78                          48.42           62.75
## 117      28.84                          51.72           58.44
## 118      61.06                          66.97           64.11
## 119      33.39                          53.80           54.27
## 120      35.25                          54.68           54.35
## 121      34.17                          54.17           68.93
## 122      46.89                          60.14           66.94
## 123      54.09                          63.53           67.92
## 124      45.24                          59.30           70.22
## 125      23.11                          48.81           61.23
## 126      34.03                          53.96           69.40
## 127      34.99                          54.29           53.12
## 128      39.68                          56.45           63.85
## 129      37.19                          55.27           71.47
## 130      19.64                          46.96           64.67
## 131      33.45                          53.49           68.78
## 132      37.63                          55.43           63.56
## 133      31.44                          52.29           51.81
## 134      28.05                          50.60           72.43
## 135      32.48                          52.70           63.61
## 136      33.51                          53.16           53.85
## 137      34.81                          53.76           67.20
## 138      33.44                          53.08           58.75
## 139      31.36                          52.04           69.00
## 140      29.30                          51.04           62.31
## 141      40.40                          56.28           60.02
## 142      40.59                          56.33           66.03
## 143      50.35                          60.96           65.81
## 144      39.13                          55.63           60.45
## 145      31.96                          52.23           71.79
## 146      35.72                          53.94           55.05
## 147      30.81                          51.58           69.88
## 148      26.28                          49.42           61.00
## 149      44.28                          57.92           64.15
## 150      38.43                          55.15           68.50
## 151      21.81                          47.27           60.78
## 152      22.11                          47.40           53.18
## 153      20.31                          46.49           58.63
## 154      29.46                          50.77           49.50
## 155      40.63                          56.03           63.26
## 156      30.37                          51.17           52.69
## 157      25.55                          48.88           68.44
## 158      29.33                          50.62           60.31
## 159      28.24                          50.05           62.06
## 160      49.26                          59.98           66.65
## 161      28.14                          49.99           60.78
## 162      36.53                          53.93           52.44
## 163      42.42                          56.70           52.95
## 164      24.03                          47.98           54.96
## 165      28.87                          50.18           55.98
## 166      21.71                          46.75           52.43
## 167      36.18                          53.56           71.88
## 168      27.28                          49.32           52.20
## 169      27.95                          49.62           64.66
## 170      30.98                          51.04           64.58
## 171      36.69                          53.72           55.28
## 172      29.42                          50.28           65.14
## 173      21.86                          46.65           53.13
## 174      29.85                          50.43           60.75
## 175      35.57                          53.07           63.74
## 176      28.91                          49.91           68.60
## 177      49.17                          59.50           64.10
## 178      25.43                          48.24           58.12
## 179      39.54                          54.85           65.38
## 180      28.00                          49.31           66.75
## 181      22.17                          46.49           52.00
## 182      28.05                          49.23           53.36
## 183      35.84                          52.70           62.06
## 184      31.64                          50.65           52.31
## 185      22.98                          46.55           52.70
## 186      33.60                          51.48           63.81
## 187      33.30                          51.29           49.06
## 188      35.02                          52.09           66.05
## 189      23.58                          46.66           55.68
## 190      29.64                          49.51           51.53
## 191      22.76                          46.23           52.03
## 192      26.47                          47.94           71.30
## 193      28.95                          49.05           63.16
## 194      47.59                          57.84           60.70
## 195      23.63                          46.50           54.03
## 196      29.22                          49.13           60.51
## 197      29.55                          49.27           59.56
## 198      36.92                          52.71           58.94
## 199      20.97                          45.04           52.98
## 200      28.33                          48.49           59.19
## 201      33.08                          50.73           62.58
## 202      29.55                          49.04           48.27
## 203      27.49                          48.04           51.88
## 204      26.58                          47.60           59.36
## 205      26.88                          47.72           64.50
## 206      24.08                          46.39           50.10
## 207      26.92                          47.66           52.61
## 208      27.73                          48.01           65.60
## 209      38.10                          52.88           65.05
## 210      26.09                          47.18           56.60
## 211      28.93                          48.48           61.63
## 212      19.98                          44.24           50.44
## 213      21.68                          44.98           50.52
## 214      21.74                          44.98           70.07
## 215      21.97                          45.07           62.60
## 216      24.43                          46.21           59.19
## 217      22.74                          45.39           73.78
## 218      30.53                          49.07           58.43
## 219      22.41                          45.15           51.01
## 220      27.37                          47.42           55.97
## 221      24.29                          45.88           68.45
## 222      35.53                          51.15           56.86
## 223      27.12                          47.16           50.72
## 224      35.79                          51.22           58.39
## 225      16.10                          41.89           62.78
## 226      23.69                          45.42           48.98
## 227      40.95                          53.59           58.52
## 228      25.90                          46.41           61.15
## 229      18.34                          42.82           56.22
## 230      19.76                          43.43           51.11
## 231      23.63                          45.23           54.31
## 232      15.89                          41.54           64.91
## 233      22.82                          44.80           53.06
## 234      35.24                          50.68           63.54
## 235      37.37                          51.68           59.94
## 236      27.34                          46.89           63.03
## 237      30.50                          48.38           48.03
## 238      21.98                          44.33           51.65
## 239      43.15                          54.30           58.50
## 240      27.29                          46.79           64.42
## 241      33.65                          49.79           56.58
## 242      31.44                          48.45           48.32
## 243      29.02                          47.24           60.52
## 244      25.25                          45.40           60.69
## 245      31.04                          48.12           55.26
## 246      23.63                          44.55           52.48
## 247      37.52                          51.09           56.66
## 248      29.58                          47.33           57.19
## 249      30.12                          47.57           54.68
## 250      23.45                          44.38           57.30
## 251      23.70                          44.48           57.33
## 252      19.23                          42.36           55.09
## 253      35.80                          50.10           55.93
## 254      30.26                          47.44           54.70
## 255      56.39                          59.77           51.33
## 256      34.22                          49.25           56.21
## 257      22.89                          43.89           45.04
## 258      26.87                          45.72           59.49
## 259      31.03                          47.68           52.40
## 260      23.00                          43.88           49.09
## 261      22.62                          43.58           50.78
## 262      24.28                          44.35           56.80
## 263      13.02                          38.94           72.88
## 264      33.57                          48.66           57.09
## 265      43.11                          53.14           54.36
## 266      32.44                          48.09           48.06
## 267      28.79                          46.34           52.30
## 268      24.72                          44.35           44.70
## 269      58.43                          60.28           50.11
## 270      25.72                          44.68           60.18
## 271      16.75                          40.14           50.93
## 272      17.69                          40.58           54.08
## 273      17.72                          40.50           46.70
## 274      28.75                          45.72           59.45
## 275      32.31                          47.31           42.01
## 276      26.34                          44.46           53.08
## 277      18.66                          40.73           60.68
## 278      35.97                          48.87           50.54
## 279      12.73                          37.85           44.92
## 280      21.26                          41.84           50.89
## 281      26.40                          44.26           55.44
## 282      26.86                          44.44           53.87
## 283      31.59                          46.62           45.69
## 284      38.03                          49.51           51.96
## 285      28.65                          45.06           58.83
## 286      24.86                          43.17           54.50
## 287      19.73                          40.73           55.83
## 288      30.85                          45.90           50.93
## 289      22.16                          41.76           54.07
## 290      30.36                          45.54           51.61
## 291      23.08                          42.08           47.61
## 292      25.01                          42.89           54.08
## 293      25.38                          43.05           51.13
## 294      31.26                          45.41           55.20
## 295      17.98                          39.09           44.97
## 296      18.18                          39.15           45.42
## 297      11.28                          35.86           43.49
## 298      18.15                          39.05           54.00
## 299      25.14                          42.29           44.64
## 300      36.27                          47.31           50.61
## 301       9.66                          34.30           63.90
## 302      19.10                          38.71           44.61
## 303      19.30                          38.24           43.85
## 304      28.59                          42.62           47.89
## 305      17.81                          37.51           37.57
## 306      30.02                          43.13           48.72
## 307      12.29                          34.63           43.18
## 308      20.25                          38.39           43.86
## 309      11.52                          34.06           41.24
## 310      29.92                          42.69           42.20
## 311      15.68                          35.81           42.74
## 312      13.41                          34.59           42.31
## 313      25.72                          40.41           52.65
## 314      27.86                          41.34           42.29
## 315      49.32                          51.42           37.47
## 316      11.34                          33.26           41.96
## 317      14.69                          34.44           41.94
## 318      23.04                          37.80           53.50
## 319      13.59                          33.33           40.31
## 320      24.72                          38.58           41.46
## 321      14.18                          33.58           43.30
## 322      17.76                          35.21           38.92
## 323      13.56                          33.18           36.36
## 324      21.87                          36.91           39.50
## 325      34.08                          42.68           51.66
## 326      14.72                          33.52           37.44
## 327      20.51                          36.24           40.51
## 328      17.21                          34.68           40.37
## 329      12.25                          32.12           37.48
## 330      28.77                          39.93           39.26
## 331      13.67                          32.62           37.77
## 332       9.56                          30.60           35.26
## 333      14.79                          33.03           45.13
## 334      10.80                          31.08           38.45
## 335      17.39                          33.87           37.32
## 336      14.06                          32.30           38.42
## 337      22.28                          36.16           39.84
## 338      12.92                          31.69           38.22
## 339      12.46                          31.40           40.41
## 340      17.05                          33.51           35.05
## 341      23.87                          36.59           39.22
## 342      24.00                          36.64           46.01
## 343      13.31                          31.46           40.14
## 344      19.71                          34.29           39.00
## 345      15.92                          32.40           45.60
## 346      14.87                          31.90           39.27
## 347      14.09                          31.51           37.22
## 348      15.25                          31.96           47.75
## 349      10.79                          29.85           36.30
## 350      15.30                          31.61           36.56
## 351      13.92                          30.75           34.99
## 352      11.73                          29.72           35.34
## 353      11.73                          29.71           34.52
## 354      20.34                          33.77           40.21
## 355      17.63                          32.40           45.08
## 356      17.34                          32.18           35.68
## 357       7.51                          27.23           35.73
## 358      18.20                          32.10           36.98
## 359      29.31                          37.33           33.29
## 360       8.87                          27.65           40.31
## 361      12.25                          29.21           30.99
## 362      14.77                          30.37           39.08
## 363      22.22                          33.87           30.77
## 364      12.11                          29.07           48.95
## 365      16.59                          31.11           32.25
## 366      16.19                          30.89           29.67
## 367      13.90                          29.76           34.36
## 368      10.13                          27.96           45.30
## 369      31.50                          38.02           37.61
## 370      16.04                          30.63           33.14
## 371      16.42                          30.32           30.83
## 372       9.83                          27.09           50.21
## 373      19.18                          31.48           43.07
## 374      11.69                          27.92           36.73
## 375      16.70                          30.25           41.63
## 376      20.60                          32.04           31.63
## 377      25.64                          34.37           39.71
## 378       5.74                          24.92           42.98
## 379      12.08                          27.92           42.93
## 380      19.52                          31.32           22.53
## 381      13.17                          28.23           36.97
## 382      15.80                          29.39           41.08
## 383      27.38                          34.86           32.79
## 384       8.45                          25.84           44.51
## 385      15.51                          29.18           36.03
## 386      12.42                          27.61           36.53
## 387      13.91                          28.29           30.93
## 388       8.17                          25.29           30.60
## 389      10.49                          26.32           28.08
## 390       9.60                          25.90           33.62
## 391      11.04                          26.57           46.11
## 392       9.86                          25.99           26.77
## 393      13.43                          27.67           31.46
## 394      12.86                          27.36           30.96
## 395      12.36                          27.10           33.08
## 396      18.96                          30.19           37.63
## 397      12.08                          26.92           28.90
## 398      11.54                          26.58           28.17
## 399      17.35                          29.27           31.51
## 400       9.68                          25.56           29.54
## 401      17.33                          29.02           29.92
## 402      11.43                          26.17           31.14
## 403      17.55                          28.98           30.71
## 404       9.22                          25.03           29.94
## 405       8.49                          24.63           32.69
## 406      13.25                          26.81           30.18
## 407       8.44                          24.48           27.69
## 408      13.42                          26.67           32.89
## 409      11.75                          25.87           29.66
## 410      14.65                          27.23           29.79
## 411       9.60                          24.77           30.26
## 412      13.06                          26.37           35.91
## 413       9.68                          24.77           25.26
## 414      10.74                          25.20           30.87
## 415      13.27                          26.36           31.34
## 416       9.29                          24.44           29.62
## 417      15.78                          27.45           36.03
## 418      15.80                          27.46           31.73
## 419      11.20                          25.24           31.34
## 420      16.41                          27.69           36.25
## 421      11.36                          25.11           27.90
## 422      12.27                          25.48           26.88
## 423       7.64                          23.25           32.57
## 424      10.18                          24.43           28.33
## 425      11.67                          25.08           27.34
## 426      10.76                          24.65           28.62
## 427       7.47                          22.78           28.38
## 428       9.89                          23.92           29.24
## 429       7.86                          22.92           29.56
## 430      10.52                          24.16           34.29
## 431      11.45                          24.60           29.43
## 432       7.32                          22.56           29.78
## 433      11.63                          24.55           33.43
## 434      10.63                          24.06           31.13
## 435      17.45                          27.28           27.87
## 436      10.87                          24.11           37.80
## 437      11.23                          24.26           28.06
## 438       8.62                          22.96           28.54
## 439       7.03                          22.14           38.13
## 440      15.30                          26.03           28.81
## 441       8.99                          23.02           28.98
## 442       7.38                          22.23           37.78
## 443       6.88                          21.93           37.34
## 444       7.58                          22.23           28.28
## 445       7.06                          21.97           26.62
## 446      12.63                          24.44           26.09
## 447       7.32                          21.85           38.34
## 448      12.00                          24.06           27.81
## 449       6.56                          21.42           29.59
## 450       9.00                          22.52           26.04
## 451       7.01                          21.41           27.89
## 452       5.61                          20.66           25.56
## 453      18.48                          26.75           28.27
## 454      17.94                          26.49           29.88
## 455       9.46                          22.47           31.33
## 456      11.28                          23.31           29.17
## 457      10.95                          23.13           26.58
## 458      10.46                          22.88           27.39
## 459       9.54                          22.44           25.05
## 460       7.94                          21.68           28.41
## 461      11.16                          23.09           27.87
## 462       6.01                          20.64           31.25
## 463       8.66                          21.87           25.05
## 464       5.74                          20.48           26.98
## 465      11.02                          22.95           26.46
## 466      10.85                          22.86           28.36
## 467       7.28                          21.13           30.27
## 468      10.53                          22.62           26.16
## 469       8.93                          21.84           33.22
## 470      30.24                          31.86           27.68
## 471       7.35                          20.97           35.44
## 472       9.67                          22.04           25.40
## 473      10.75                          22.31           27.50
## 474      11.68                          22.65           24.50
## 475      10.43                          22.00           24.78
## 476      10.48                          22.01           25.66
## 477       5.15                          19.23           27.07
## 478       7.23                          20.16           25.59
## 479       7.40                          20.22           26.77
## 480       8.34                          20.62           26.12
## 481       6.03                          19.48           28.10
## 482       9.36                          21.02           25.60
## 483       9.49                          21.06           28.92
## 484      10.30                          21.39           26.75
## 485       9.26                          20.72           28.38
## 486       9.96                          20.89           26.63
## 487       7.55                          19.62           24.69
## 488      10.46                          20.87           23.36
## 489      10.22                          20.70           21.03
## 490       9.43                          20.23           24.99
## 491      14.71                          22.67           26.85
## 492      14.53                          22.37           23.17
## 493       9.30                          19.89           24.32
## 494       5.72                          18.19           26.53
## 495      20.31                          24.90           26.63
## 496       6.88                          18.47           24.07
## 497       8.73                          19.23           25.80
## 498       6.18                          17.96           25.14
## 499       7.41                          18.23           20.28
## 500       8.43                          18.64           28.40
## 501       7.38                          17.93           26.76
## 502       9.92                          19.04           21.17
## 503       4.40                          16.39           25.51
## 504       8.60                          18.20           26.53
## 505       8.80                          18.23           19.40
## 506       6.83                          17.21           24.26
## 507       8.36                          17.78           22.23
## 508       5.70                          16.39           25.46
## 509       7.48                          17.16           23.37
## 510       5.27                          16.10           22.76
## 511       5.24                          16.01           21.31
## 512       4.98                          15.76           23.87
## 513       4.40                          15.46           25.73
## 514       9.89                          18.01           24.18
## 515       6.90                          16.53           25.91
## 516       6.00                          15.90           23.35
## 517       4.44                          15.14           23.21
## 518       6.21                          15.76           24.63
## 519       5.19                          15.22           24.89
## 520       3.67                          14.33           21.09
## 521       6.15                          15.50           20.89
## 522       3.75                          14.33           18.01
## 523       3.78                          14.31           23.78
## 524       5.99                          15.26           23.02
## 525       4.50                          14.12           21.62
## 526       4.04                          13.85           22.91
## 527       4.32                          13.85           23.87
## 528       4.40                          13.88           23.66
## 529       5.05                          14.19           22.21
## 530       5.21                          14.25           22.45
## 531       3.43                          13.41           20.13
## 532       3.78                          13.52           22.26
## 533       5.45                          14.02           21.93
## 534       4.26                          13.35           21.09
## 535       4.70                          12.39           19.21
## 536       4.69                          12.36           18.14
##     Restaurant.Price.Index Local.Purchasing.Power.Index
## 1                   151.77                       114.19
## 2                   127.14                       142.39
## 3                   129.10                       141.48
## 4                   122.83                       132.58
## 5                   114.86                       115.48
## 6                   119.78                       133.47
## 7                   127.87                        94.21
## 8                   120.62                       131.26
## 9                   134.55                       112.62
## 10                  114.42                       104.30
## 11                  116.35                       108.19
## 12                  100.00                       100.00
## 13                  120.45                       113.08
## 14                   94.58                       125.95
## 15                   86.72                       113.58
## 16                   78.76                       138.38
## 17                   95.27                        87.05
## 18                   86.23                       131.53
## 19                   82.55                       116.47
## 20                  113.18                       114.05
## 21                   73.48                       106.06
## 22                   99.49                       120.25
## 23                   82.29                       186.00
## 24                   80.27                       140.00
## 25                   54.41                       113.09
## 26                   88.11                        95.38
## 27                  112.90                       114.26
## 28                   87.60                       119.03
## 29                   81.44                       120.46
## 30                   97.34                       113.36
## 31                   87.71                        98.88
## 32                   50.34                       102.63
## 33                   95.15                       116.80
## 34                   91.85                       100.22
## 35                   78.55                       137.74
## 36                   94.99                       108.83
## 37                   83.08                       124.57
## 38                   59.40                        99.15
## 39                   87.98                        89.32
## 40                   69.34                       128.25
## 41                   72.82                        84.71
## 42                   77.64                       108.77
## 43                   74.75                       109.34
## 44                   79.47                       114.89
## 45                   78.53                        93.47
## 46                   72.47                       108.39
## 47                   73.72                       135.16
## 48                   72.77                        96.07
## 49                   77.97                       128.82
## 50                   80.73                        99.34
## 51                   81.71                       114.51
## 52                   85.86                        93.67
## 53                   83.57                        99.44
## 54                   78.52                       133.70
## 55                   85.51                       115.83
## 56                   88.19                        70.47
## 57                   68.35                       112.76
## 58                   84.91                       102.30
## 59                   84.93                       125.69
## 60                   65.02                       103.52
## 61                   85.41                        85.39
## 62                   77.60                        83.45
## 63                   88.94                       103.12
## 64                   74.72                       105.57
## 65                   83.14                       170.91
## 66                   78.69                        76.97
## 67                   66.74                       114.28
## 68                   84.70                       112.81
## 69                   81.89                        89.99
## 70                   87.07                       100.24
## 71                   60.92                       100.33
## 72                   91.99                       124.41
## 73                   77.91                       145.88
## 74                   75.80                       100.44
## 75                   77.18                        77.62
## 76                   88.45                        94.77
## 77                   79.28                       139.93
## 78                   86.36                        97.30
## 79                   85.71                       122.77
## 80                   82.50                       119.13
## 81                   54.05                        76.49
## 82                   71.50                        95.54
## 83                   80.36                        96.92
## 84                   84.44                        93.41
## 85                   46.37                       102.10
## 86                   70.76                       131.85
## 87                   81.23                       125.99
## 88                   73.78                       119.38
## 89                   65.25                       103.89
## 90                   71.47                       130.05
## 91                   71.60                       126.03
## 92                   81.15                       111.02
## 93                   70.81                        94.37
## 94                   81.11                        96.78
## 95                   84.57                        74.87
## 96                   72.83                       104.75
## 97                   77.01                       127.77
## 98                   80.50                       114.57
## 99                   90.89                       121.22
## 100                  86.02                       106.74
## 101                  75.27                        94.56
## 102                  74.67                       109.85
## 103                  72.30                        80.96
## 104                  86.23                       100.60
## 105                  76.67                       142.25
## 106                  72.71                       119.67
## 107                  90.52                       128.24
## 108                  67.20                       115.58
## 109                  75.64                       133.75
## 110                  68.26                       127.17
## 111                  83.88                       121.84
## 112                  86.14                       106.28
## 113                  77.46                        87.88
## 114                  78.11                       122.21
## 115                  67.68                        99.50
## 116                  71.65                       104.62
## 117                  81.94                        96.13
## 118                  79.21                       144.91
## 119                  79.83                       112.68
## 120                  70.09                       113.28
## 121                  71.96                       114.33
## 122                  73.06                       150.38
## 123                  76.90                       130.34
## 124                  74.59                       111.58
## 125                  71.79                       114.79
## 126                  69.34                       107.87
## 127                  74.50                       132.91
## 128                  64.54                       116.39
## 129                  70.69                       104.81
## 130                  71.20                        91.24
## 131                  77.88                       104.54
## 132                  79.19                       142.12
## 133                  87.08                       107.73
## 134                  61.05                        99.86
## 135                  67.94                       104.56
## 136                  66.51                       135.30
## 137                  71.87                       109.93
## 138                  80.86                       110.16
## 139                  67.63                       132.56
## 140                  72.75                       111.16
## 141                  78.68                       135.82
## 142                  72.96                       127.77
## 143                  78.34                       151.25
## 144                  69.33                       134.54
## 145                  39.36                        28.32
## 146                  82.28                        70.43
## 147                  71.98                        91.12
## 148                  70.54                       111.52
## 149                  67.53                        99.45
## 150                  69.67                       130.10
## 151                  64.07                       112.89
## 152                  81.05                       126.99
## 153                  71.32                       111.90
## 154                  81.79                       128.46
## 155                  70.06                       153.77
## 156                  80.84                       107.70
## 157                  63.92                       118.14
## 158                  75.49                       122.33
## 159                  69.68                       105.12
## 160                  67.35                        94.65
## 161                  67.61                        98.85
## 162                  87.30                       117.20
## 163                  78.93                        87.36
## 164                  78.34                        85.60
## 165                  78.14                       113.55
## 166                  74.86                       161.95
## 167                  66.40                       155.96
## 168                  67.80                       112.56
## 169                  76.92                       124.03
## 170                  62.75                       141.64
## 171                  78.14                        72.99
## 172                  71.31                       149.05
## 173                  67.53                       126.88
## 174                  71.93                       138.51
## 175                  71.41                       107.87
## 176                  58.42                        99.86
## 177                  76.79                       136.29
## 178                  76.33                       122.17
## 179                  72.99                       140.97
## 180                  59.29                       112.05
## 181                  66.93                       141.04
## 182                  80.41                       119.62
## 183                  71.73                       161.28
## 184                  58.53                       112.36
## 185                  66.87                        97.87
## 186                  68.60                        94.96
## 187                  64.14                       130.11
## 188                  58.84                       124.45
## 189                  65.18                       140.16
## 190                  66.42                       133.27
## 191                  59.44                       134.85
## 192                  59.97                       128.82
## 193                  70.58                       151.58
## 194                  58.50                       128.99
## 195                  66.60                       106.22
## 196                  69.57                       129.45
## 197                  72.20                       144.40
## 198                  66.04                       128.77
## 199                  72.24                        86.70
## 200                  68.65                       124.45
## 201                  61.82                       108.98
## 202                  78.62                        87.24
## 203                  75.35                       121.47
## 204                  70.42                       125.07
## 205                  60.41                       113.98
## 206                  66.17                       120.91
## 207                  68.35                       138.99
## 208                  67.08                       124.84
## 209                  59.95                       106.89
## 210                  72.21                       107.14
## 211                  63.28                       125.24
## 212                  57.36                        90.74
## 213                  56.77                       131.77
## 214                  63.82                       124.37
## 215                  64.97                        91.21
## 216                  56.46                       110.36
## 217                  32.95                        95.59
## 218                  68.12                       138.60
## 219                  71.76                       107.34
## 220                  68.51                       119.92
## 221                  58.51                       100.45
## 222                  70.27                       140.43
## 223                  66.04                        78.81
## 224                  60.01                       112.72
## 225                  60.07                       140.18
## 226                  76.45                        92.06
## 227                  59.61                       151.02
## 228                  67.22                       109.58
## 229                  59.15                        68.80
## 230                  67.14                       146.98
## 231                  63.64                        92.65
## 232                  41.79                        29.03
## 233                  60.00                       152.96
## 234                  62.47                       132.62
## 235                  64.12                       129.83
## 236                  61.80                       133.53
## 237                  80.25                       106.94
## 238                  68.38                       109.87
## 239                  68.02                       153.42
## 240                  63.21                       128.27
## 241                  72.47                       146.15
## 242                  70.79                       139.02
## 243                  58.47                       106.34
## 244                  61.07                       117.12
## 245                  71.44                       129.66
## 246                  63.98                       122.68
## 247                  65.73                       144.61
## 248                  60.41                       124.02
## 249                  76.08                       120.12
## 250                  64.33                       135.99
## 251                  58.50                       115.79
## 252                  64.01                        88.55
## 253                  66.10                       150.76
## 254                  62.10                       144.70
## 255                  61.18                       139.76
## 256                  51.65                        97.41
## 257                  70.56                       133.83
## 258                  62.36                       129.54
## 259                  63.41                       137.31
## 260                  71.97                       119.46
## 261                  77.19                       100.69
## 262                  64.34                       135.19
## 263                  28.17                        65.41
## 264                  63.36                       128.68
## 265                  72.49                       155.88
## 266                  60.42                        80.46
## 267                  67.16                       116.48
## 268                  67.48                       121.31
## 269                  63.20                       116.42
## 270                  56.84                       136.21
## 271                  59.39                        80.13
## 272                  60.71                       112.73
## 273                  70.81                        74.05
## 274                  59.43                       116.61
## 275                  64.39                        54.43
## 276                  62.20                       127.16
## 277                  61.21                       102.88
## 278                  61.81                       153.07
## 279                  62.38                        52.48
## 280                  55.69                       125.57
## 281                  63.52                       144.07
## 282                  66.45                       123.93
## 283                  64.44                        91.36
## 284                  62.27                       136.81
## 285                  60.20                       162.04
## 286                  60.08                       141.91
## 287                  53.74                        51.20
## 288                  63.79                       120.44
## 289                  59.41                       131.70
## 290                  57.55                        93.91
## 291                  63.25                       118.79
## 292                  59.78                       111.27
## 293                  58.73                       129.74
## 294                  52.09                       150.96
## 295                  56.33                        50.08
## 296                  55.82                        83.22
## 297                  58.35                        49.84
## 298                  50.33                        53.97
## 299                  61.39                        77.56
## 300                  35.26                        14.15
## 301                  25.32                       110.16
## 302                  50.53                        78.01
## 303                  52.36                        90.32
## 304                  54.77                        72.63
## 305                  60.44                        74.16
## 306                  56.33                        43.49
## 307                  53.30                        45.41
## 308                  53.13                        83.49
## 309                  61.99                        80.84
## 310                  48.79                        55.01
## 311                  53.97                        80.73
## 312                  50.28                        51.11
## 313                  29.92                        44.50
## 314                  40.54                       102.11
## 315                  54.61                       153.68
## 316                  42.72                        54.56
## 317                  43.99                        66.88
## 318                  26.37                        44.96
## 319                  39.91                        72.57
## 320                  53.53                        94.38
## 321                  35.34                       118.44
## 322                  37.82                        54.47
## 323                  47.56                        56.56
## 324                  42.58                        59.38
## 325                  38.61                        72.16
## 326                  51.53                        92.40
## 327                  53.00                        87.90
## 328                  50.49                        51.83
## 329                  34.96                       117.30
## 330                  25.06                        11.84
## 331                  44.56                        83.33
## 332                  28.80                         2.24
## 333                  37.30                        40.02
## 334                  41.88                        90.05
## 335                  53.01                        90.92
## 336                  34.25                       125.38
## 337                  42.14                        71.93
## 338                  34.80                        64.30
## 339                  32.03                       133.28
## 340                  48.83                        61.08
## 341                  37.83                        77.71
## 342                  33.42                       105.16
## 343                  34.75                        27.70
## 344                  47.20                        91.00
## 345                  35.92                        32.08
## 346                  36.69                        35.23
## 347                  40.60                        44.10
## 348                  28.58                        58.71
## 349                  43.53                        58.45
## 350                  34.18                        61.88
## 351                  42.21                        83.65
## 352                  43.65                        32.05
## 353                  41.31                        61.43
## 354                  43.45                        55.74
## 355                  25.71                        22.53
## 356                  42.93                       108.84
## 357                  33.88                        60.74
## 358                  32.93                        75.09
## 359                  48.98                        59.51
## 360                  25.83                        91.05
## 361                  42.79                        52.58
## 362                  34.49                        39.76
## 363                  32.43                        29.36
## 364                  22.16                        73.49
## 365                  38.79                        41.16
## 366                  40.01                        36.57
## 367                  42.56                        63.24
## 368                  24.70                        76.04
## 369                  35.68                        79.45
## 370                  35.79                        57.49
## 371                  38.37                        76.20
## 372                  23.81                        59.51
## 373                  27.58                        28.42
## 374                  30.83                        51.76
## 375                  25.04                        82.84
## 376                  39.89                        76.34
## 377                  29.22                        86.03
## 378                  18.94                        40.85
## 379                  22.28                        41.36
## 380                  42.75                       139.17
## 381                  35.98                        30.62
## 382                  24.79                        28.95
## 383                  43.81                        73.59
## 384                  24.08                        27.20
## 385                  31.08                        39.34
## 386                  30.38                        79.20
## 387                  38.21                        70.10
## 388                  32.84                        27.96
## 389                  32.38                        48.63
## 390                  30.99                        84.10
## 391                  20.17                        33.13
## 392                  33.38                        35.94
## 393                  40.72                        98.98
## 394                  39.75                        58.57
## 395                  32.60                        61.94
## 396                  27.12                        82.93
## 397                  36.15                        40.22
## 398                  35.39                        41.02
## 399                  34.82                        76.70
## 400                  34.44                        52.16
## 401                  33.78                        70.68
## 402                  36.24                        76.26
## 403                  40.88                        57.01
## 404                  29.14                        49.70
## 405                  34.34                        52.57
## 406                  33.34                        77.35
## 407                  38.34                        53.50
## 408                  26.71                        46.21
## 409                  37.47                        59.76
## 410                  30.29                        66.32
## 411                  28.58                        47.26
## 412                  21.05                        44.08
## 413                  32.27                        38.94
## 414                  35.35                        55.46
## 415                  33.54                        56.94
## 416                  30.17                        56.37
## 417                  30.16                        94.00
## 418                  24.11                        40.04
## 419                  27.85                        50.13
## 420                  19.56                        30.36
## 421                  32.27                        77.78
## 422                  30.21                        61.98
## 423                  35.96                        45.00
## 424                  31.35                        35.89
## 425                  31.56                        71.81
## 426                  32.52                        60.25
## 427                  23.94                        50.19
## 428                  32.88                        53.70
## 429                  30.19                        60.20
## 430                  21.53                        24.37
## 431                  32.23                        53.01
## 432                  30.88                        53.02
## 433                  28.20                        82.62
## 434                  25.89                        44.63
## 435                  28.86                        59.11
## 436                  21.20                        27.54
## 437                  40.12                        42.96
## 438                  28.06                        61.04
## 439                  16.96                        37.81
## 440                  28.35                        40.76
## 441                  29.59                        56.52
## 442                  15.10                        28.81
## 443                  28.82                        25.91
## 444                  36.72                        41.50
## 445                  27.80                        50.21
## 446                  27.92                        37.44
## 447                  13.44                        30.83
## 448                  37.00                        41.22
## 449                  25.13                        64.55
## 450                  28.69                        41.45
## 451                  26.30                        51.30
## 452                  29.16                        40.99
## 453                  29.54                        40.89
## 454                  30.51                        51.40
## 455                  24.29                        33.64
## 456                  33.07                        79.87
## 457                  38.05                        46.29
## 458                  34.16                        40.78
## 459                  24.07                        42.73
## 460                  23.59                        56.87
## 461                  24.50                        34.02
## 462                  27.42                        61.79
## 463                  30.43                        32.92
## 464                  21.44                        57.91
## 465                  39.27                        51.62
## 466                  31.16                        49.09
## 467                  20.52                        26.40
## 468                  26.26                        37.30
## 469                  21.35                        36.42
## 470                  27.83                        19.41
## 471                  16.61                        15.06
## 472                  33.31                        33.43
## 473                  30.98                        57.98
## 474                  31.66                        43.40
## 475                  33.68                        41.38
## 476                  31.59                        49.19
## 477                  20.72                        26.48
## 478                  24.92                        59.11
## 479                  29.60                        50.01
## 480                  17.97                        27.91
## 481                  20.73                        41.15
## 482                  25.09                        24.38
## 483                  28.03                        64.69
## 484                  31.52                        53.68
## 485                  27.45                        57.83
## 486                  27.52                       113.89
## 487                  23.02                        39.31
## 488                  29.22                        39.57
## 489                  25.50                        31.26
## 490                  21.66                        25.17
## 491                  29.38                        54.23
## 492                  23.51                        39.37
## 493                  31.25                        34.29
## 494                  24.44                        40.29
## 495                  26.36                        67.69
## 496                  24.36                        44.80
## 497                  25.30                        77.75
## 498                  24.53                        89.48
## 499                  24.78                        36.44
## 500                  23.63                         4.18
## 501                  22.68                        86.55
## 502                  20.42                        30.39
## 503                  21.18                        68.43
## 504                  18.70                        96.51
## 505                  21.91                        31.62
## 506                  15.87                        35.51
## 507                  21.10                        68.94
## 508                  19.17                        64.37
## 509                  19.20                        50.11
## 510                  23.12                        39.75
## 511                  23.26                        26.31
## 512                  18.29                        77.10
## 513                  15.97                        50.73
## 514                  20.97                        81.00
## 515                  15.97                        67.87
## 516                  21.09                        60.41
## 517                  19.82                        76.50
## 518                  20.14                        54.97
## 519                  17.40                        70.18
## 520                  19.02                        23.06
## 521                  18.57                        36.66
## 522                  15.53                        28.43
## 523                  17.75                        66.45
## 524                  17.35                        78.00
## 525                  16.99                        98.45
## 526                  13.70                        71.26
## 527                  13.38                        45.78
## 528                  13.42                        67.00
## 529                  15.92                        79.58
## 530                  14.39                        56.46
## 531                  15.56                        68.22
## 532                  14.43                        74.59
## 533                  12.20                        73.42
## 534                  17.09                        55.47
## 535                  12.55                       138.06
## 536                  11.93                        68.15
set.seed(450)

Basic Visualization of the data and getting acquainted with it

dim(data) #get the dimensiality of dataset
## [1] 536   8
sapply(data, class) #get the class of the dataset
##                           Rank                           City 
##                      "integer"                       "factor" 
##           Cost.of.Living.Index                     Rent.Index 
##                      "numeric"                      "numeric" 
## Cost.of.Living.Plus.Rent.Index                Groceries.Index 
##                      "numeric"                      "numeric" 
##         Restaurant.Price.Index   Local.Purchasing.Power.Index 
##                      "numeric"                      "numeric"
levels(data$City) #see all the different factors in the City variable
##   [1] "Aachen, Germany"                      
##   [2] "Aalborg, Denmark"                     
##   [3] "Abbotsford, Canada"                   
##   [4] "Aberdeen, United Kingdom"             
##   [5] "Abu Dhabi, United Arab Emirates"      
##   [6] "Accra, Ghana"                         
##   [7] "Ad Dammam, Saudi Arabia"              
##   [8] "Addis Ababa, Ethiopia"                
##   [9] "Adelaide, Australia"                  
##  [10] "Ahmedabad, India"                     
##  [11] "Al Khobar, Saudi Arabia"              
##  [12] "Albany, NY, United States"            
##  [13] "Albuquerque, NM, United States"       
##  [14] "Alexandria, Egypt"                    
##  [15] "Algiers, Algeria"                     
##  [16] "Alicante, Spain"                      
##  [17] "Almaty, Kazakhstan"                   
##  [18] "Amman, Jordan"                        
##  [19] "Amsterdam, Netherlands"               
##  [20] "Anchorage, AK, United States"         
##  [21] "Ankara, Turkey"                       
##  [22] "Ann Arbor, MI, United States"         
##  [23] "Antalya, Turkey"                      
##  [24] "Antwerp, Belgium"                     
##  [25] "Arad, Romania"                        
##  [26] "Arhus, Denmark"                       
##  [27] "Arlington, TX, United States"         
##  [28] "Asheville, NC, United States"         
##  [29] "Astana, Kazakhstan"                   
##  [30] "Asuncion, Paraguay"                   
##  [31] "Athens, Greece"                       
##  [32] "Atlanta, GA, United States"           
##  [33] "Auckland, New Zealand"                
##  [34] "Austin, TX, United States"            
##  [35] "Baghdad, Iraq"                        
##  [36] "Bakersfield, CA, United States"       
##  [37] "Baku, Azerbaijan"                     
##  [38] "Bali, Indonesia"                      
##  [39] "Baltimore, MD, United States"         
##  [40] "Bandar Seri Begawan, Brunei"          
##  [41] "Bandung, Indonesia"                   
##  [42] "Bangalore, India"                     
##  [43] "Bangkok, Thailand"                    
##  [44] "Banja Luka, Bosnia And Herzegovina"   
##  [45] "Barcelona, Spain"                     
##  [46] "Barranquilla, Colombia"               
##  [47] "Barrie, Canada"                       
##  [48] "Basel, Switzerland"                   
##  [49] "Bath, United Kingdom"                 
##  [50] "Beijing, China"                       
##  [51] "Beirut, Lebanon"                      
##  [52] "Belfast, United Kingdom"              
##  [53] "Belgrade, Serbia"                     
##  [54] "Bellevue, WA, United States"          
##  [55] "Bellingham, WA, United States"        
##  [56] "Belo Horizonte, Brazil"               
##  [57] "Bergen, Norway"                       
##  [58] "Berkeley, CA, United States"          
##  [59] "Berlin, Germany"                      
##  [60] "Bern, Switzerland"                    
##  [61] "Bhopal, India"                        
##  [62] "Bhubaneswar, India"                   
##  [63] "Birmingham, AL, United States"        
##  [64] "Birmingham, United Kingdom"           
##  [65] "Bogota, Colombia"                     
##  [66] "Boise, ID, United States"             
##  [67] "Bologna, Italy"                       
##  [68] "Bonn, Germany"                        
##  [69] "Bordeaux, France"                     
##  [70] "Boston, MA, United States"            
##  [71] "Boulder, CO, United States"           
##  [72] "Braga, Portugal"                      
##  [73] "Brampton, Canada"                     
##  [74] "Brasilia, Brazil"                     
##  [75] "Brasov, Romania"                      
##  [76] "Bratislava, Slovakia"                 
##  [77] "Bremen, Germany"                      
##  [78] "Brighton, United Kingdom"             
##  [79] "Brisbane, Australia"                  
##  [80] "Bristol, United Kingdom"              
##  [81] "Brno, Czech Republic"                 
##  [82] "Brooklyn, NY, United States"          
##  [83] "Brussels, Belgium"                    
##  [84] "Bucharest, Romania"                   
##  [85] "Budapest, Hungary"                    
##  [86] "Buenos Aires, Argentina"              
##  [87] "Buffalo, NY, United States"           
##  [88] "Burgas, Bulgaria"                     
##  [89] "Burlington, Canada"                   
##  [90] "Burlington, VT, United States"        
##  [91] "Burnaby, Canada"                      
##  [92] "Bursa, Turkey"                        
##  [93] "Bydgoszcz, Poland"                    
##  [94] "Cagliari, Italy"                      
##  [95] "Cairo, Egypt"                         
##  [96] "Calgary, Canada"                      
##  [97] "Cali, Colombia"                       
##  [98] "Cambridge, United Kingdom"            
##  [99] "Campinas, Brazil"                     
## [100] "Canberra, Australia"                  
## [101] "Cancun, Mexico"                       
## [102] "Cape Town, South Africa"              
## [103] "Caracas, Venezuela"                   
## [104] "Cardiff, United Kingdom"              
## [105] "Casablanca, Morocco"                  
## [106] "Cebu, Philippines"                    
## [107] "Chandigarh, India"                    
## [108] "Charleston, SC, United States"        
## [109] "Charlotte, NC, United States"         
## [110] "Chattanooga, TN, United States"       
## [111] "Chelyabinsk, Russia"                  
## [112] "Chengdu, China"                       
## [113] "Chennai, India"                       
## [114] "Chiang Mai, Thailand"                 
## [115] "Chicago, IL, United States"           
## [116] "Chisinau, Moldova"                    
## [117] "Christchurch, New Zealand"            
## [118] "Cincinnati, OH, United States"        
## [119] "Cleveland, OH, United States"         
## [120] "Cluj-Napoca, Romania"                 
## [121] "Coimbatore, India"                    
## [122] "Coimbra, Portugal"                    
## [123] "Cologne, Germany"                     
## [124] "Colombo, Sri Lanka"                   
## [125] "Columbia, SC, United States"          
## [126] "Columbus, OH, United States"          
## [127] "Constanta, Romania"                   
## [128] "Copenhagen, Denmark"                  
## [129] "Coquitlam, Canada"                    
## [130] "Cork, Ireland"                        
## [131] "Coventry, United Kingdom"             
## [132] "Craiova, Romania"                     
## [133] "Cuenca, Ecuador"                      
## [134] "Curitiba, Brazil"                     
## [135] "Dallas, TX, United States"            
## [136] "Dar es Salaam, Tanzania"              
## [137] "Darwin, Australia"                    
## [138] "Davao, Philippines"                   
## [139] "Dayton, OH, United States"            
## [140] "Debrecen, Hungary"                    
## [141] "Delhi, India"                         
## [142] "Denver, CO, United States"            
## [143] "Derby, United Kingdom"                
## [144] "Des Moines, IA, United States"        
## [145] "Detroit, MI, United States"           
## [146] "Dhaka, Bangladesh"                    
## [147] "Dnipro, Ukraine"                      
## [148] "Doha, Qatar"                          
## [149] "Dresden, Germany"                     
## [150] "Dubai, United Arab Emirates"          
## [151] "Dublin, Ireland"                      
## [152] "Dumaguete, Philippines"               
## [153] "Dunedin, New Zealand"                 
## [154] "Durban, South Africa"                 
## [155] "Dusseldorf, Germany"                  
## [156] "Edinburgh, United Kingdom"            
## [157] "Edmonton, Canada"                     
## [158] "Eindhoven, Netherlands"               
## [159] "El Paso, TX, United States"           
## [160] "Espoo, Finland"                       
## [161] "Eugene, OR, United States"            
## [162] "Everett, WA, United States"           
## [163] "Exeter, United Kingdom"               
## [164] "Fayetteville, AR, United States"      
## [165] "Florence, Italy"                      
## [166] "Florianopolis, Brazil"                
## [167] "Fort Myers, FL, United States"        
## [168] "Fort Wayne, IN, United States"        
## [169] "Fort Worth, TX, United States"        
## [170] "Frankfurt, Germany"                   
## [171] "Fresno, CA, United States"            
## [172] "Funchal, Portugal"                    
## [173] "Gainesville, FL, United States"       
## [174] "Galway, Ireland"                      
## [175] "Gdansk, Poland"                       
## [176] "Gdynia, Poland"                       
## [177] "Geneva, Switzerland"                  
## [178] "Genoa, Italy"                         
## [179] "Gent, Belgium"                        
## [180] "Glasgow, United Kingdom"              
## [181] "Goa, India"                           
## [182] "Gold Coast, Australia"                
## [183] "Gothenburg, Sweden"                   
## [184] "Granada, Spain"                       
## [185] "Grand Rapids, MI, United States"      
## [186] "Graz, Austria"                        
## [187] "Greensboro, NC, United States"        
## [188] "Grenoble, France"                     
## [189] "Groningen, Netherlands"               
## [190] "Guadalajara, Mexico"                  
## [191] "Guangzhou, China"                     
## [192] "Guatemala City, Guatemala"            
## [193] "Guayaquil, Ecuador"                   
## [194] "Gurgaon, India"                       
## [195] "Guwahati, India"                      
## [196] "Haifa, Israel"                        
## [197] "Halifax, Canada"                      
## [198] "Hamburg, Germany"                     
## [199] "Hamilton, Bermuda"                    
## [200] "Hamilton, Canada"                     
## [201] "Hamilton, New Zealand"                
## [202] "Hanoi, Vietnam"                       
## [203] "Hanover, Germany"                     
## [204] "Harare, Zimbabwe"                     
## [205] "Hartford, CT, United States"          
## [206] "Havana, Cuba"                         
## [207] "Heidelberg, Germany"                  
## [208] "Helsinki, Finland"                    
## [209] "Ho Chi Minh City, Vietnam"            
## [210] "Hobart, Australia"                    
## [211] "Hong Kong, Hong Kong"                 
## [212] "Honolulu, HI, United States"          
## [213] "Houston, TX, United States"           
## [214] "Huntsville, AL, United States"        
## [215] "Hyderabad, India"                     
## [216] "Iasi, Romania"                        
## [217] "Indianapolis, IN, United States"      
## [218] "Indore, India"                        
## [219] "Innsbruck, Austria"                   
## [220] "Irbil, Iraq"                          
## [221] "Irvine, CA, United States"            
## [222] "Islamabad, Pakistan"                  
## [223] "Istanbul, Turkey"                     
## [224] "Izmir, Turkey"                        
## [225] "Jacksonville, FL, United States"      
## [226] "Jaipur, India"                        
## [227] "Jakarta, Indonesia"                   
## [228] "Jeddah (Jiddah), Saudi Arabia"        
## [229] "Jersey City, NJ, United States"       
## [230] "Jerusalem, Israel"                    
## [231] "Johannesburg, South Africa"           
## [232] "Johor Bahru, Malaysia"                
## [233] "Kaliningrad, Russia"                  
## [234] "Kampala, Uganda"                      
## [235] "Kansas City, MO, United States"       
## [236] "Kaohsiung, Taiwan"                    
## [237] "Karachi, Pakistan"                    
## [238] "Karlsruhe, Germany"                   
## [239] "Kathmandu, Nepal"                     
## [240] "Katowice, Poland"                     
## [241] "Kaunas, Lithuania"                    
## [242] "Kazan, Russia"                        
## [243] "Kelowna, Canada"                      
## [244] "Kharkiv, Ukraine"                     
## [245] "Kiev, Ukraine"                        
## [246] "Kingston, Canada"                     
## [247] "Kingston, Jamaica"                    
## [248] "Kitchener, Canada"                    
## [249] "Klaipeda, Lithuania"                  
## [250] "Knoxville, TN, United States"         
## [251] "Kochi, India"                         
## [252] "Kolkata, India"                       
## [253] "Kosice, Slovakia"                     
## [254] "Kota Kinabalu, Malaysia"              
## [255] "Krakow (Cracow), Poland"              
## [256] "Krasnodar, Russia"                    
## [257] "Kuala Lumpur, Malaysia"               
## [258] "Kuching, Malaysia"                    
## [259] "Lagos, Nigeria"                       
## [260] "Lahore, Pakistan"                     
## [261] "Larnaca, Cyprus"                      
## [262] "Las Palmas de Gran Canaria, Spain"    
## [263] "Las Vegas, NV, United States"         
## [264] "Lausanne, Switzerland"                
## [265] "Leeds, United Kingdom"                
## [266] "Leicester, United Kingdom"            
## [267] "Leiden, Netherlands"                  
## [268] "Leipzig, Germany"                     
## [269] "Leuven, Belgium"                      
## [270] "Lexington, KY, United States"         
## [271] "Lille, France"                        
## [272] "Lima, Peru"                           
## [273] "Limassol, Cyprus"                     
## [274] "Limerick, Ireland"                    
## [275] "Linz, Austria"                        
## [276] "Lisbon, Portugal"                     
## [277] "Little Rock, AR, United States"       
## [278] "Liverpool, United Kingdom"            
## [279] "Ljubljana, Slovenia"                  
## [280] "Lodz, Poland"                         
## [281] "London, Canada"                       
## [282] "London, United Kingdom"               
## [283] "Long Beach, CA, United States"        
## [284] "Los Angeles, CA, United States"       
## [285] "Louisville, KY, United States"        
## [286] "Lubbock, TX, United States"           
## [287] "Lublin, Poland"                       
## [288] "Lucknow (Lakhnau), India"             
## [289] "Ludhiana, India"                      
## [290] "Lugano, Switzerland"                  
## [291] "Luxembourg, Luxembourg"               
## [292] "Lviv, Ukraine"                        
## [293] "Lyon, France"                         
## [294] "Maastricht, Netherlands"              
## [295] "Madison, WI, United States"           
## [296] "Madrid, Spain"                        
## [297] "Makati, Philippines"                  
## [298] "Malaga, Spain"                        
## [299] "Male, Maldives"                       
## [300] "Malmo, Sweden"                        
## [301] "Manama, Bahrain"                      
## [302] "Manchester, United Kingdom"           
## [303] "Mangalore, India"                     
## [304] "Manila, Philippines"                  
## [305] "Mannheim, Germany"                    
## [306] "Maribor, Slovenia"                    
## [307] "Marseille, France"                    
## [308] "Medellin, Colombia"                   
## [309] "Melbourne, Australia"                 
## [310] "Memphis, TN, United States"           
## [311] "Merida, Mexico"                       
## [312] "Mexico City, Mexico"                  
## [313] "Miami, FL, United States"             
## [314] "Milan, Italy"                         
## [315] "Milton Keynes, United Kingdom"        
## [316] "Milwaukee, WI, United States"         
## [317] "Minneapolis, MN, United States"       
## [318] "Minsk, Belarus"                       
## [319] "Mississauga, Canada"                  
## [320] "Moncton, Canada"                      
## [321] "Monterrey, Mexico"                    
## [322] "Montevideo, Uruguay"                  
## [323] "Montpellier, France"                  
## [324] "Montreal, Canada"                     
## [325] "Moscow, Russia"                       
## [326] "Mumbai, India"                        
## [327] "Munich, Germany"                      
## [328] "Muscat, Oman"                         
## [329] "Mysore, India"                        
## [330] "Nagpur, India"                        
## [331] "Nairobi, Kenya"                       
## [332] "Nanaimo, BC, Canada"                  
## [333] "Nantes, France"                       
## [334] "Naples, Italy"                        
## [335] "Nashville, TN, United States"         
## [336] "Navi Mumbai, India"                   
## [337] "New Orleans, LA, United States"       
## [338] "New York, NY, United States"          
## [339] "Newcastle upon Tyne, United Kingdom"  
## [340] "Newcastle, Australia"                 
## [341] "Nice, France"                         
## [342] "Nicosia, Cyprus"                      
## [343] "Nis, Serbia"                          
## [344] "Nizhny Novgorod, Russia"              
## [345] "Noida, India"                         
## [346] "Norwich, United Kingdom"              
## [347] "Nottingham, United Kingdom"           
## [348] "Novi Sad, Serbia"                     
## [349] "Novosibirsk, Russia"                  
## [350] "Nuremberg, Germany"                   
## [351] "Oakland, CA, United States"           
## [352] "Odense, Denmark"                      
## [353] "Odessa, Ukraine"                      
## [354] "Oklahoma City, OK, United States"     
## [355] "Olomouc, Czech Republic"              
## [356] "Olympia, WA, United States"           
## [357] "Oradea, Romania"                      
## [358] "Orlando, FL, United States"           
## [359] "Osaka, Japan"                         
## [360] "Oshawa, Canada"                       
## [361] "Osijek, Croatia"                      
## [362] "Oslo, Norway"                         
## [363] "Ostrava, Czech Republic"              
## [364] "Ottawa, Canada"                       
## [365] "Oxford, United Kingdom"               
## [366] "Padova, Italy"                        
## [367] "Palermo, Italy"                       
## [368] "Palma de Mallorca, Spain"             
## [369] "Panama City, Panama"                  
## [370] "Paramaribo, Suriname"                 
## [371] "Paris, France"                        
## [372] "Pattaya, Thailand"                    
## [373] "Penang, Malaysia"                     
## [374] "Peoria, IL, United States"            
## [375] "Perth, Australia"                     
## [376] "Petaling Jaya, Malaysia"              
## [377] "Peterborough, United Kingdom"         
## [378] "Philadelphia, PA, United States"      
## [379] "Phnom Penh, Cambodia"                 
## [380] "Phoenix, AZ, United States"           
## [381] "Phuket, Thailand"                     
## [382] "Pittsburgh, PA, United States"        
## [383] "Plovdiv, Bulgaria"                    
## [384] "Plymouth, United Kingdom"             
## [385] "Podgorica, Montenegro"                
## [386] "Port Elizabeth, South Africa"         
## [387] "Port of Spain, Trinidad And Tobago"   
## [388] "Portland, ME, United States"          
## [389] "Portland, OR, United States"          
## [390] "Porto Alegre, Brazil"                 
## [391] "Porto, Portugal"                      
## [392] "Portsmouth, United Kingdom"           
## [393] "Poznan, Poland"                       
## [394] "Prague, Czech Republic"               
## [395] "Pretoria, South Africa"               
## [396] "Pristina, Kosovo (Disputed Territory)"
## [397] "Puebla, Mexico"                       
## [398] "Puerto Vallarta, Mexico"              
## [399] "Pune, India"                          
## [400] "Quebec City, Canada"                  
## [401] "Queretaro, Mexico"                    
## [402] "Quezon City, Philippines"             
## [403] "Quito, Ecuador"                       
## [404] "Rabat, Morocco"                       
## [405] "Raleigh, NC, United States"           
## [406] "Ramat Gan, Israel"                    
## [407] "Reading, United Kingdom"              
## [408] "Recife, Brazil"                       
## [409] "Red Deer, Canada"                     
## [410] "Regina, Canada"                       
## [411] "Reno, NV, United States"              
## [412] "Reykjavik, Iceland"                   
## [413] "Richmond, VA, United States"          
## [414] "Riga, Latvia"                         
## [415] "Rijeka, Croatia"                      
## [416] "Rio de Janeiro, Brazil"               
## [417] "Riyadh, Saudi Arabia"                 
## [418] "Rochester, NY, United States"         
## [419] "Rome, Italy"                          
## [420] "Rostov-na-donu, Russia"               
## [421] "Rotterdam, Netherlands"               
## [422] "Sacramento, CA, United States"        
## [423] "Saint Louis, MO, United States"       
## [424] "Saint Paul, MN, United States"        
## [425] "Saint Petersburg, FL, United States"  
## [426] "Saint Petersburg, Russia"             
## [427] "Salem, OR, United States"             
## [428] "Salt Lake City, UT, United States"    
## [429] "Samara, Russia"                       
## [430] "San Antonio, TX, United States"       
## [431] "San Diego, CA, United States"         
## [432] "San Francisco, CA, United States"     
## [433] "San Jose, CA, United States"          
## [434] "San Jose, Costa Rica"                 
## [435] "San Juan, Puerto Rico"                
## [436] "San Salvador, El Salvador"            
## [437] "Santa Barbara, CA, United States"     
## [438] "Santa Cruz de Tenerife, Spain"        
## [439] "Santa Rosa, CA, United States"        
## [440] "Santiago, Chile"                      
## [441] "Santo Domingo, Dominican Republic"    
## [442] "Sao Paulo, Brazil"                    
## [443] "Sarajevo, Bosnia And Herzegovina"     
## [444] "Saskatoon, Canada"                    
## [445] "Seattle, WA, United States"           
## [446] "Selangor, Malaysia"                   
## [447] "Seoul, South Korea"                   
## [448] "Seville (Sevilla), Spain"             
## [449] "Shanghai, China"                      
## [450] "Sharjah, United Arab Emirates"        
## [451] "Sheffield, United Kingdom"            
## [452] "Shenzhen, China"                      
## [453] "Sibiu, Romania"                       
## [454] "Singapore, Singapore"                 
## [455] "Skopje, Macedonia"                    
## [456] "Sliema, Malta"                        
## [457] "Sofia, Bulgaria"                      
## [458] "Southampton, United Kingdom"          
## [459] "Split, Croatia"                       
## [460] "Spokane, WA, United States"           
## [461] "Springfield, MO, United States"       
## [462] "St. John's, NL, Canada"               
## [463] "Stavanger, Norway"                    
## [464] "Stockholm, Sweden"                    
## [465] "Strasbourg, France"                   
## [466] "Stuttgart, Germany"                   
## [467] "Sumy, Ukraine"                        
## [468] "Surabaya, Indonesia"                  
## [469] "Surat, India"                         
## [470] "Surrey, Canada"                       
## [471] "Suzhou, China"                        
## [472] "Swindon, United Kingdom"              
## [473] "Sydney, Australia"                    
## [474] "Syracuse, NY, United States"          
## [475] "Szczecin, Poland"                     
## [476] "Szeged, Hungary"                      
## [477] "Tacoma, WA, United States"            
## [478] "Taichung, Taiwan"                     
## [479] "Taipei, Taiwan"                       
## [480] "Tallahassee, FL, United States"       
## [481] "Tallinn, Estonia"                     
## [482] "Tampa, FL, United States"             
## [483] "Tampere, Finland"                     
## [484] "Tartu, Estonia"                       
## [485] "Tashkent, Uzbekistan"                 
## [486] "Tbilisi, Georgia"                     
## [487] "Tehran, Iran"                         
## [488] "Tel Aviv-Yafo, Israel"                
## [489] "Thane, India"                         
## [490] "The Hague (Den Haag), Netherlands"    
## [491] "Thessaloniki, Greece"                 
## [492] "Thiruvananthapuram, India"            
## [493] "Tijuana, Mexico"                      
## [494] "Timisoara, Romania"                   
## [495] "Tirana, Albania"                      
## [496] "Tokyo, Japan"                         
## [497] "Toledo, OH, United States"            
## [498] "Toronto, Canada"                      
## [499] "Toulouse, France"                     
## [500] "Trieste, Italy"                       
## [501] "Trondheim, Norway"                    
## [502] "Tucson, AZ, United States"            
## [503] "Tulsa, OK, United States"             
## [504] "Tunis, Tunisia"                       
## [505] "Turin, Italy"                         
## [506] "Turku, Finland"                       
## [507] "Ulaanbaatar, Mongolia"                
## [508] "Uppsala, Sweden"                      
## [509] "Utrecht, Netherlands"                 
## [510] "Vadodara, India"                      
## [511] "Valencia, Spain"                      
## [512] "Vancouver, Canada"                    
## [513] "Vancouver, WA, United States"         
## [514] "Varna, Bulgaria"                      
## [515] "Victoria, Canada"                     
## [516] "Vienna, Austria"                      
## [517] "Vilnius, Lithuania"                   
## [518] "Virginia Beach, VA, United States"    
## [519] "Visakhapatnam, India"                 
## [520] "Voronezh, Russia"                     
## [521] "Warsaw, Poland"                       
## [522] "Washington, DC, United States"        
## [523] "Wellington, New Zealand"              
## [524] "West Palm Beach, FL, United States"   
## [525] "Wichita, KS, United States"           
## [526] "Windhoek, Namibia"                    
## [527] "Windsor, Canada"                      
## [528] "Winnipeg, Canada"                     
## [529] "Wroclaw, Poland"                      
## [530] "Yekaterinburg, Russia"                
## [531] "Yerevan, Armenia"                     
## [532] "Yogyakarta, Indonesia"                
## [533] "York, United Kingdom"                 
## [534] "Zagreb, Croatia"                      
## [535] "Zaragoza (Saragossa), Spain"          
## [536] "Zurich, Switzerland"
summary(data)#get the basic summary of the whole dataset
##       Rank                                    City    
##  Min.   :  1.0   Aachen, Germany                :  1  
##  1st Qu.:134.8   Aalborg, Denmark               :  1  
##  Median :268.5   Abbotsford, Canada             :  1  
##  Mean   :268.5   Aberdeen, United Kingdom       :  1  
##  3rd Qu.:402.2   Abu Dhabi, United Arab Emirates:  1  
##  Max.   :536.0   Accra, Ghana                   :  1  
##                  (Other)                        :530  
##  Cost.of.Living.Index   Rent.Index     Cost.of.Living.Plus.Rent.Index
##  Min.   : 19.26       Min.   :  3.43   Min.   : 12.36                
##  1st Qu.: 39.37       1st Qu.: 11.69   1st Qu.: 26.65                
##  Median : 61.97       Median : 23.09   Median : 44.45                
##  Mean   : 57.19       Mean   : 25.21   Mean   : 42.05                
##  3rd Qu.: 70.86       3rd Qu.: 33.44   3rd Qu.: 53.09                
##  Max.   :137.56       Max.   :106.49   Max.   :121.21                
##                                                                      
##  Groceries.Index  Restaurant.Price.Index Local.Purchasing.Power.Index
##  Min.   : 18.01   Min.   : 11.93         Min.   :  2.24              
##  1st Qu.: 31.50   1st Qu.: 31.55         1st Qu.: 56.79              
##  Median : 51.57   Median : 59.41         Median : 94.11              
##  Mean   : 49.76   Mean   : 54.68         Mean   : 89.49              
##  3rd Qu.: 62.76   3rd Qu.: 72.34         3rd Qu.:119.50              
##  Max.   :127.35   Max.   :151.77         Max.   :186.00              
## 

Variable Selection with Linear Regression Analysis

#we will perform a linear regression to predict rank based on all other variables

#We just have to get rid of the numerical predictor ()
CL=data.frame(data$Rank,data$Cost.of.Living.Index,data$Rent.Index,data$Cost.of.Living.Plus.Rent.Index,data$Groceries.Index,data$Restaurant.Price.Index,data$Local.Purchasing.Power.Index)
head(CL)
##   data.Rank data.Cost.of.Living.Index data.Rent.Index
## 1         1                    137.56          103.03
## 2         2                    128.65           62.62
## 3         3                    126.89           46.14
## 4         4                    119.62           50.35
## 5         5                    118.42           39.22
## 6         6                    118.33           69.16
##   data.Cost.of.Living.Plus.Rent.Index data.Groceries.Index
## 1                              121.21               126.56
## 2                               97.39               127.35
## 3                               88.66               120.44
## 4                               86.83               116.35
## 5                               80.93               114.54
## 6                               95.06               112.08
##   data.Restaurant.Price.Index data.Local.Purchasing.Power.Index
## 1                      151.77                            114.19
## 2                      127.14                            142.39
## 3                      129.10                            141.48
## 4                      122.83                            132.58
## 5                      114.86                            115.48
## 6                      119.78                            133.47
lm<- lm(Rank ~ ., data=CL)
summary(lm)
## Warning in summary.lm(lm): essentially perfect fit: summary may be
## unreliable
## 
## Call:
## lm(formula = Rank ~ ., data = CL)
## 
## Residuals:
##        Min         1Q     Median         3Q        Max 
## -1.792e-13 -1.077e-14 -2.080e-15  9.100e-15  1.061e-12 
## 
## Coefficients:
##                                       Estimate Std. Error    t value
## (Intercept)                         -2.357e-13  3.979e-14 -5.923e+00
## data.Rank                            1.000e+00  5.520e-17  1.812e+16
## data.Cost.of.Living.Index            4.260e-13  3.204e-13  1.330e+00
## data.Rent.Index                      3.804e-13  2.880e-13  1.321e+00
## data.Cost.of.Living.Plus.Rent.Index -8.039e-13  6.084e-13 -1.321e+00
## data.Groceries.Index                 4.225e-16  4.815e-16  8.770e-01
## data.Restaurant.Price.Index         -1.969e-16  3.409e-16 -5.780e-01
## data.Local.Purchasing.Power.Index   -4.706e-18  8.500e-17 -5.500e-02
##                                     Pr(>|t|)    
## (Intercept)                         5.69e-09 ***
## data.Rank                            < 2e-16 ***
## data.Cost.of.Living.Index              0.184    
## data.Rent.Index                        0.187    
## data.Cost.of.Living.Plus.Rent.Index    0.187    
## data.Groceries.Index                   0.381    
## data.Restaurant.Price.Index            0.564    
## data.Local.Purchasing.Power.Index      0.956    
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 5.033e-14 on 528 degrees of freedom
## Multiple R-squared:      1,  Adjusted R-squared:      1 
## F-statistic: 7.237e+32 on 7 and 528 DF,  p-value: < 2.2e-16

This won’t tell us too much with all the predictors (some of which may be not significant predictors)

We will backward selection manually using alpha = 0.05 as a threshold. We will go one-by-one removing all the predictors with p-values > 0.05.

summary(lm(Rank ~ ., data=CL))
## Warning in summary.lm(lm(Rank ~ ., data = CL)): essentially perfect fit:
## summary may be unreliable
## 
## Call:
## lm(formula = Rank ~ ., data = CL)
## 
## Residuals:
##        Min         1Q     Median         3Q        Max 
## -1.792e-13 -1.077e-14 -2.080e-15  9.100e-15  1.061e-12 
## 
## Coefficients:
##                                       Estimate Std. Error    t value
## (Intercept)                         -2.357e-13  3.979e-14 -5.923e+00
## data.Rank                            1.000e+00  5.520e-17  1.812e+16
## data.Cost.of.Living.Index            4.260e-13  3.204e-13  1.330e+00
## data.Rent.Index                      3.804e-13  2.880e-13  1.321e+00
## data.Cost.of.Living.Plus.Rent.Index -8.039e-13  6.084e-13 -1.321e+00
## data.Groceries.Index                 4.225e-16  4.815e-16  8.770e-01
## data.Restaurant.Price.Index         -1.969e-16  3.409e-16 -5.780e-01
## data.Local.Purchasing.Power.Index   -4.706e-18  8.500e-17 -5.500e-02
##                                     Pr(>|t|)    
## (Intercept)                         5.69e-09 ***
## data.Rank                            < 2e-16 ***
## data.Cost.of.Living.Index              0.184    
## data.Rent.Index                        0.187    
## data.Cost.of.Living.Plus.Rent.Index    0.187    
## data.Groceries.Index                   0.381    
## data.Restaurant.Price.Index            0.564    
## data.Local.Purchasing.Power.Index      0.956    
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 5.033e-14 on 528 degrees of freedom
## Multiple R-squared:      1,  Adjusted R-squared:      1 
## F-statistic: 7.237e+32 on 7 and 528 DF,  p-value: < 2.2e-16
# The predictor with the greatest p-value is Local Purchasing Power Index (with a p-value of 0.956), so we will remove that one

summary(lm(Rank ~ CL$data.Cost.of.Living.Index+CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index+CL$data.Restaurant.Price.Index, data=CL))
## 
## Call:
## lm(formula = Rank ~ CL$data.Cost.of.Living.Index + CL$data.Rent.Index + 
##     CL$data.Cost.of.Living.Plus.Rent.Index + CL$data.Groceries.Index + 
##     CL$data.Restaurant.Price.Index, data = CL)
## 
## Residuals:
##    Min     1Q Median     3Q    Max 
## -78.47 -19.63   3.21  16.34 346.69 
## 
## Coefficients:
##                                         Estimate Std. Error t value
## (Intercept)                             693.6673     6.8777 100.858
## CL$data.Cost.of.Living.Index             77.7586   253.8245   0.306
## CL$data.Rent.Index                       76.6571   228.1565   0.336
## CL$data.Cost.of.Living.Plus.Rent.Index -163.4072   482.0143  -0.339
## CL$data.Groceries.Index                   1.1048     0.3725   2.966
## CL$data.Restaurant.Price.Index            0.2171     0.2592   0.838
##                                        Pr(>|t|)    
## (Intercept)                             < 2e-16 ***
## CL$data.Cost.of.Living.Index            0.75946    
## CL$data.Rent.Index                      0.73702    
## CL$data.Cost.of.Living.Plus.Rent.Index  0.73474    
## CL$data.Groceries.Index                 0.00315 ** 
## CL$data.Restaurant.Price.Index          0.40256    
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 39.9 on 530 degrees of freedom
## Multiple R-squared:  0.9342, Adjusted R-squared:  0.9336 
## F-statistic:  1506 on 5 and 530 DF,  p-value: < 2.2e-16
# The remaining predictor with the greatest p-value is Cost of Living Index (with a p-value of 0.75946), so we will remove that one.
#This is interesting as one would assume cost of living would be highly related to the rank of the city.

summary(lm(Rank ~ CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index+CL$data.Restaurant.Price.Index, data=CL))
## 
## Call:
## lm(formula = Rank ~ CL$data.Rent.Index + CL$data.Cost.of.Living.Plus.Rent.Index + 
##     CL$data.Groceries.Index + CL$data.Restaurant.Price.Index, 
##     data = CL)
## 
## Residuals:
##    Min     1Q Median     3Q    Max 
## -78.23 -19.37   3.10  16.21 347.22 
## 
## Coefficients:
##                                        Estimate Std. Error t value
## (Intercept)                            693.6202     6.8701 100.963
## CL$data.Rent.Index                       6.7621     0.5432  12.450
## CL$data.Cost.of.Living.Plus.Rent.Index -15.7435     1.0769 -14.619
## CL$data.Groceries.Index                  1.0953     0.3709   2.953
## CL$data.Restaurant.Price.Index           0.2182     0.2589   0.843
##                                        Pr(>|t|)    
## (Intercept)                             < 2e-16 ***
## CL$data.Rent.Index                      < 2e-16 ***
## CL$data.Cost.of.Living.Plus.Rent.Index  < 2e-16 ***
## CL$data.Groceries.Index                 0.00328 ** 
## CL$data.Restaurant.Price.Index          0.39982    
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 39.87 on 531 degrees of freedom
## Multiple R-squared:  0.9342, Adjusted R-squared:  0.9337 
## F-statistic:  1886 on 4 and 531 DF,  p-value: < 2.2e-16
# The remaining predictor with the greatest p-value is Restaurant Price Index (with a p-value of 0.39982), so we will remove that one  

summary(lm(Rank ~ CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index, data=CL))
## 
## Call:
## lm(formula = Rank ~ CL$data.Rent.Index + CL$data.Cost.of.Living.Plus.Rent.Index + 
##     CL$data.Groceries.Index, data = CL)
## 
## Residuals:
##    Min     1Q Median     3Q    Max 
## -78.20 -18.41   2.91  16.44 347.39 
## 
## Coefficients:
##                                        Estimate Std. Error t value
## (Intercept)                            690.4663     5.7593  119.89
## CL$data.Rent.Index                       6.4237     0.3657   17.57
## CL$data.Cost.of.Living.Plus.Rent.Index -14.9792     0.5803  -25.81
## CL$data.Groceries.Index                  0.9240     0.3101    2.98
##                                        Pr(>|t|)    
## (Intercept)                             < 2e-16 ***
## CL$data.Rent.Index                      < 2e-16 ***
## CL$data.Cost.of.Living.Plus.Rent.Index  < 2e-16 ***
## CL$data.Groceries.Index                 0.00302 ** 
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 39.85 on 532 degrees of freedom
## Multiple R-squared:  0.9342, Adjusted R-squared:  0.9338 
## F-statistic:  2516 on 3 and 532 DF,  p-value: < 2.2e-16
#all significant (p-values < 0.05)

finalLinearMod= (lm(Rank ~ CL$data.Rent.Index+CL$data.Cost.of.Living.Plus.Rent.Index+CL$data.Groceries.Index, data=CL))

The remaining 3 predictors (Rent Index, Cost of Living Plus Rent Index, Groceries Index), now have p-values < alpha = 0.05, so these predictors will remain in our final linear model.

To clarify, this analysis was not done to actually predict the rank based on factors (as will be done in the majority of our analyses) but to explore the predictors (Which are significant and which are not? Why might this be the case?)

This process of variable selection helps to show us the most significant predictors in determining Rank of a city (a high rank corresponds to high overall cost to live in that city).

This gives us an equation of the line of Rank= 6.4237Rent.Index - 14.9792Cost.of.Living.Plus.Rent.Index + 0.9240*Groceries.Index + 690.4663

It was unsurprising to see Rent Index was a significant predictor of overall cost of living as rent is the largest expense for most people.

At first, it was surprising that Cost of Living Index (excludes rent) by itself wasn’t a significant predictor of rank. One may think this would be significant, as it seems in direct relation to overall cost to live in that city (and thus, its rank). However, it appears that cost of living index only becomes significant when rent index is considered along with it. This makes sense with the large magnitude of rent - even if other living expenses are cheap, if housing is expensive, the overall price to live will still likely be high (and vice.versa).

Groceries Index is the only non-rent related significant predictor. This is a bit surprising but a potential explanation is certain cities due to isolation from other cities (relatively small islands for example) have very high grocery prices due to shipping costs. These additional costs could be very significant (and has no relation to rent as rent could be low with high grocery prices). To exemplify this, the number 1 ranked city (most expensive to live in overall) has a high Groceries Index of 126.56 (26.56% higher than New York City), and is located on a (relatively) small island.

Overall, this linear regression variable selection gives us an idea on which variables are most significant predictors in determining Rank. This is important for interpretability. It becomes difficult to interpret linear regression (and other methods) when they are many variables (as there may be lots of interaction effect and noise). This interaction effect will be discussed in the multiple linear regression analysis.

Multiple Linear Regression

fit <- lm(data$Rank~data$Cost.of.Living.Index+data$Rent.Index+data$Cost.of.Living.Plus.Rent.Index+data$Groceries.Index+data$Restaurant.Price.Index+data$Local.Purchasing.Power.Index)
summary(fit)
## 
## Call:
## lm(formula = data$Rank ~ data$Cost.of.Living.Index + data$Rent.Index + 
##     data$Cost.of.Living.Plus.Rent.Index + data$Groceries.Index + 
##     data$Restaurant.Price.Index + data$Local.Purchasing.Power.Index)
## 
## Residuals:
##    Min     1Q Median     3Q    Max 
## -82.70 -17.50   2.81  15.48 330.46 
## 
## Coefficients:
##                                       Estimate Std. Error t value Pr(>|t|)
## (Intercept)                          700.98819    7.31348  95.849  < 2e-16
## data$Cost.of.Living.Index             53.49352  252.33816   0.212 0.832195
## data$Rent.Index                       55.09453  226.81745   0.243 0.808175
## data$Cost.of.Living.Plus.Rent.Index -117.73226  479.18684  -0.246 0.806016
## data$Groceries.Index                   1.27808    0.37521   3.406 0.000709
## data$Restaurant.Price.Index            0.42486    0.26790   1.586 0.113354
## data$Local.Purchasing.Power.Index     -0.18669    0.06646  -2.809 0.005152
##                                        
## (Intercept)                         ***
## data$Cost.of.Living.Index              
## data$Rent.Index                        
## data$Cost.of.Living.Plus.Rent.Index    
## data$Groceries.Index                ***
## data$Restaurant.Price.Index            
## data$Local.Purchasing.Power.Index   ** 
## ---
## Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
## 
## Residual standard error: 39.64 on 529 degrees of freedom
## Multiple R-squared:  0.9352, Adjusted R-squared:  0.9345 
## F-statistic:  1273 on 6 and 529 DF,  p-value: < 2.2e-16

By performing a Multiple Linear Regression on this dataset, with “Rank” being the response variable, we are able to determine how much of an influence each predictor has on the response variable “Rank”. This measure of significance is expressed in the above summary output of the data where we can see that the “Rank” increases relative to the estimate values for the predictor variables. Using this method of analysis we can determine that, for instance, as the “Cost of Living Index” increases, the rate at which rank will increase by is 53.49352. The influence of the “Rent Index” is also very similar with a estimate of 55.09453. An interesting predictor that has a negative correlation with respect to rank is the “Cost of Living Plus Rent Index” where the rank of the city increases as the predictor decreases at a rate estimate of -117.73226. Lastly the “Groceries Index”, “Restaurant Price Index”, and “Local Purchasing Power Index” predictors are less significant predictors with respect to the ranking of countries compared to the “Cost of Living Index” and “Rent Index”. Therefore, the cost of living index, rank index and cost of living plus rent index have the greatest influence on the rank of the countries within this dataset and are the most significant predictors with respect to the rank of a country. While the remaining predictors are far less significant in comparison. We are able to draw this inference since our Adjusted R-squared is equal to 0.9345 which tells us there is minor variation as the independent variables explain our response variable.

Regression Tree

library(tree)
## Warning: package 'tree' was built under R version 3.4.4
library(gclus)
## Warning: package 'gclus' was built under R version 3.4.4
## Loading required package: cluster
## Warning: package 'cluster' was built under R version 3.4.4
data1 <- data[,-2]
head(data1)
##   Rank Cost.of.Living.Index Rent.Index Cost.of.Living.Plus.Rent.Index
## 1    1               137.56     103.03                         121.21
## 2    2               128.65      62.62                          97.39
## 3    3               126.89      46.14                          88.66
## 4    4               119.62      50.35                          86.83
## 5    5               118.42      39.22                          80.93
## 6    6               118.33      69.16                          95.06
##   Groceries.Index Restaurant.Price.Index Local.Purchasing.Power.Index
## 1          126.56                 151.77                       114.19
## 2          127.35                 127.14                       142.39
## 3          120.44                 129.10                       141.48
## 4          116.35                 122.83                       132.58
## 5          114.54                 114.86                       115.48
## 6          112.08                 119.78                       133.47
simtree <- tree(Rank~Cost.of.Living.Index+Rent.Index+Cost.of.Living.Plus.Rent.Index+Groceries.Index+Restaurant.Price.Index+Local.Purchasing.Power.Index,data = data1)
summary(simtree)
## 
## Regression tree:
## tree(formula = Rank ~ Cost.of.Living.Index + Rent.Index + Cost.of.Living.Plus.Rent.Index + 
##     Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index, 
##     data = data1)
## Variables actually used in tree construction:
## [1] "Cost.of.Living.Index"
## Number of terminal nodes:  8 
## Residual mean deviance:  379.7 = 200500 / 528 
## Distribution of residuals:
##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
##     -33     -17       0       0      17      33
plot(simtree)
text(simtree, pretty=0)

After performing a Regression Tree analysis of the dataset we are presented with the tree above. At first glance we notice that all tree splitting is done with respect to “Cost of Living Index” and this can be because of many things. In this case the splitting happens on this predictor variable due to the fact that it is greatly correlated to the rank of a country. This characteristic was also observed in our Multiple Linear Regression Analysis proving that the “Cost of Living Index” significantly influences a countries given rank. Another noticeable trait is that there is a linear relation such that as the “Cost of Living Index” increases, the rank of a country increasesalong with it. In other words a counrty that is expensive to live in whith respect to taxes, food, rent, etc. will also be a very successful and thriving counrty nonetheless. This may not come off as a surprise, but as a given person within their respective country is spending more than the average person on living costs, their quality of living is often higher than average aswell. Notice that the Regression Tree summary provides us with an absurdly large MSE of 379.7. This is to be expected as we are indeed overfitting the data and also the fact that the rank is greatly influenced by the “Cost of Living Index”. Although this analysis does not help us draw any real inference as to how the other predictor variables affect the rank, we have proved that the “Cost of Living Index” is the most significant.

simtree1 <- tree(Rank~.,data=data1)
summary(simtree1)
## 
## Regression tree:
## tree(formula = Rank ~ ., data = data1)
## Variables actually used in tree construction:
## [1] "Cost.of.Living.Index"
## Number of terminal nodes:  8 
## Residual mean deviance:  379.7 = 200500 / 528 
## Distribution of residuals:
##    Min. 1st Qu.  Median    Mean 3rd Qu.    Max. 
##     -33     -17       0       0      17      33
plot(simtree1)
text(simtree1, pretty=0)

By removing the “Cost of Living Index” from the Regression Tree Analysis we see that the splitting occurs with respect to the “Cost of Living Plus Rent Index”. This proves that the second most significant predictor variable is indeed “Cost of Living Plus Rent Index”. It also becomes evident that as the “Cost of Living Plus Rent Index” increases, the rank decreases, showing that there is a negative correltion between the two variables. This was also determined in the Multiple Linear Regression Analysis and has become solidified as a result of this analysis. Removing a predictor variable has resulted in a larger MSE of 1938 which is also expected.

library(tree)
cvsimtree <- cv.tree(simtree, FUN=prune.tree, K=10)
plot(cvsimtree, type="b")

newtree <- prune.tree(simtree, best=7)
plot(newtree)
text(newtree, pretty=0)

test_predict<-predict(newtree,data1)
mean((data1$Rank-test_predict)^2)
## [1] 374

KNN-Classification

splitting data

library(caret)
## Warning: package 'caret' was built under R version 3.4.4
## Loading required package: lattice
## Warning: package 'lattice' was built under R version 3.4.4
## Loading required package: ggplot2
## Warning: package 'ggplot2' was built under R version 3.4.4
## Warning in as.POSIXlt.POSIXct(Sys.time()): unknown timezone 'zone/tz/2018i.
## 1.0/zoneinfo/America/Vancouver'
train<-createDataPartition(y=data$Rank,p=.7,list=F)
training<-data[train,]
testing<-data[-train,]

10 fold cross validation repeated three times

control<-trainControl(method="repeatedcv",number = 10,repeats=3)
knn<-train(Rank~.,data=training,method="knn",trControl=control,preProcess=c("center","scale"),tuneLength=20)
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad, Romania,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBristol, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States, CityBursa,
## Turkey, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCluj-Napoca, Romania, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es Salaam,
## Tanzania, CityDavao, Philippines, CityDelhi, India, CityDes Moines,
## IA, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEdmonton, Canada,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGainesville, FL, United States,
## CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland, CityGent,
## Belgium, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGreensboro, NC, United States, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJaipur, India, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLong Beach, CA, United States, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMiami,
## FL, United States, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhoenix, AZ, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortland, OR, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRiga, Latvia,
## CityRijeka, Croatia, CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia,
## CitySaint Petersburg, FL, United States, CitySaint Petersburg, Russia,
## CitySamara, Russia, CitySan Diego, CA, United States, CitySan Francisco,
## CA, United States, CitySan Jose, Costa Rica, CitySanta Barbara, CA,
## United States, CitySantiago, Chile, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CitySplit, Croatia, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTacoma, WA, United States, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAnn Arbor, MI, United States, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBoston, MA, United States,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBudapest, Hungary, CityBuffalo, NY,
## United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCaracas,
## Venezuela, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityCologne, Germany, CityColombo, Sri
## Lanka, CityColumbia, SC, United States, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityDebrecen, Hungary, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEl Paso, TX, United States, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHanover, Germany,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKansas City, MO,
## United States, CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeeds, United Kingdom, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLondon,
## United Kingdom, CityLos Angeles, CA, United States, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMannheim, Germany, CityMaribor, Slovenia,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMontevideo, Uruguay, CityMunich, Germany, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica,
## Montenegro, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRotterdam, Netherlands, CitySacramento, CA, United States,
## CitySaint Petersburg, Russia, CitySalt Lake City, UT, United States,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySanta Rosa, CA, United States, CitySanto Domingo, Dominican Republic,
## CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityValencia, Spain, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWest Palm
## Beach, FL, United States, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlgiers, Algeria, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBarranquilla, Colombia, CityBarrie, Canada, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBerlin, Germany, CityBhopal,
## India, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDurban, South Africa,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett, WA, United
## States, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHamburg, Germany, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityIrbil, Iraq, CityIslamabad, Pakistan,
## CityIzmir, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKiev, Ukraine, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV, United
## States, CityLausanne, Switzerland, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityMontpellier, France,
## CityMontreal, Canada, CityMuscat, Oman, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNovi
## Sad, Serbia, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityOttawa, Canada, CityOxford, United Kingdom, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPetaling Jaya, Malaysia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Louis, MO, United States, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySelangor,
## Malaysia, CityShanghai, China, CitySingapore, Singapore, CitySliema,
## Malta, CitySpokane, WA, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityTampere, Finland, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurku, Finland, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWashington, DC, United States, CityWichita, KS,
## United States, CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAdelaide, Australia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlbuquerque, NM, United States, CityAlexandria,
## Egypt, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArhus,
## Denmark, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBali, Indonesia, CityBangalore, India, CityBanja
## Luka, Bosnia And Herzegovina, CityBarranquilla, Colombia, CityBasel,
## Switzerland, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBirmingham,
## AL, United States, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrisbane,
## Australia, CityBrooklyn, NY, United States, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityBydgoszcz, Poland, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChennai, India, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityJersey City,
## NJ, United States, CityJohannesburg, South Africa, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKochi, India, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNashville, TN, United States, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityPanama City,
## Panama, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPorto Alegre, Brazil,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQuebec City, Canada, CityQueretaro, Mexico, CityQuito, Ecuador,
## CityRabat, Morocco, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySanta Barbara, CA, United States, CitySaskatoon, Canada, CityShanghai,
## China, CitySheffield, United Kingdom, CitySingapore, Singapore, CitySofia,
## Bulgaria, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityWindsor, Canada, CityYork, United
## Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaltimore, MD, United States,
## CityBangkok, Thailand, CityBarranquilla, Colombia, CityBeijing, China,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBremen, Germany, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCuenca, Ecuador, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKaliningrad, Russia, CityKarachi, Pakistan, CityKarlsruhe,
## Germany, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener,
## Canada, CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu,
## Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur, Malaysia,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeipzig, Germany, CityLeuven, Belgium, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMelbourne,
## Australia, CityMexico City, Mexico, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlympia, WA,
## United States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityPalma de Mallorca,
## Spain, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuezon City, Philippines,
## CityQuito, Ecuador, CityRamat Gan, Israel, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Jose, CA, United States, CitySanta Barbara,
## CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityThiruvananthapuram, India,
## CityTijuana, Mexico, CityTimisoara, Romania, CityToledo, OH, United States,
## CityToronto, Canada, CityToulouse, France, CityTrieste, Italy, CityTunis,
## Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWichita, KS, United States, CityYerevan, Armenia, CityZagreb, Croatia,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington, TX,
## United States, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBelo Horizonte,
## Brazil, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrno, Czech
## Republic, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurnaby, Canada, CityCagliari, Italy, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityCharleston, SC, United States,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter, United
## Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN, United
## States, CityFrankfurt, Germany, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGrenoble, France, CityGroningen, Netherlands, CityGuadalajara,
## Mexico, CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United
## States, CityJerusalem, Israel, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania, CityKazan, Russia,
## CityKelowna, Canada, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria,
## Spain, CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLima,
## Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLucknow
## (Lakhnau), India, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMakati, Philippines, CityMale, Maldives, CityMalmo,
## Sweden, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinneapolis, MN, United States,
## CityMinsk, Belarus, CityMonterrey, Mexico, CityMysore, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle
## upon Tyne, United Kingdom, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh,
## NC, United States, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CityRome, Italy, CityRostov-na-donu, Russia, CitySaint Paul, MN,
## United States, CitySaint Petersburg, Russia, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTallinn, Estonia, CityTashkent, Uzbekistan, CityTbilisi,
## Georgia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC,
## United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityAustin, TX, United States, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBucharest, Romania, CityBuffalo, NY, United States, CityBurlington,
## VT, United States, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCuritiba, Brazil,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGoa, India,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndore, India, CityJakarta, Indonesia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeicester,
## United Kingdom, CityLeiden, Netherlands, CityLeuven, Belgium,
## CityLexington, KY, United States, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLviv, Ukraine, CityLyon, France,
## CityMaastricht, Netherlands, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOdessa,
## Ukraine, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRed Deer,
## Canada, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem,
## OR, United States, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySao Paulo, Brazil,
## CitySeattle, WA, United States, CitySeville (Sevilla), Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurat, India,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTokyo, Japan, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbbotsford,
## Canada, CityAccra, Ghana, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAmman, Jordan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBaku,
## Azerbaijan, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia,
## Brazil, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDallas, TX, United States,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHamilton, New Zealand, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIasi, Romania, CityIndore, India, CityIrvine,
## CA, United States, CityJacksonville, FL, United States, CityJeddah
## (Jiddah), Saudi Arabia, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKampala, Uganda, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKnoxville,
## TN, United States, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLubbock, TX, United States, CityLudhiana, India,
## CityLugano, Switzerland, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMerida,
## Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle, Australia,
## CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia,
## CityNorwich, United Kingdom, CityNottingham, United Kingdom, CityNuremberg,
## Germany, CityOakland, CA, United States, CityOdense, Denmark, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPittsburgh, PA, United
## States, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai,
## China, CitySingapore, Singapore, CitySpringfield, MO, United States,
## CityStavanger, Norway, CityStockholm, Sweden, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySuzhou, China, CitySwindon, United Kingdom, CitySyracuse, NY, United
## States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityYogyakarta, Indonesia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntalya, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBandar Seri Begawan, Brunei, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerkeley, CA, United States, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBrussels, Belgium, CityBuffalo, NY, United States,
## CityCairo, Egypt, CityCalgary, Canada, CityCali, Colombia, CityCambridge,
## United Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityChiang Mai, Thailand, CityChisinau,
## Moldova, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCraiova, Romania, CityDarwin,
## Australia, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityDumaguete, Philippines, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Myers, FL, United States, CityFort Wayne, IN,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGeneva, Switzerland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHeidelberg, Germany, CityHobart, Australia, CityHonolulu,
## HI, United States, CityHouston, TX, United States, CityHuntsville, AL,
## United States, CityIndore, India, CityInnsbruck, Austria, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMumbai, India, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNoida, India, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPort
## of Spain, Trinidad And Tobago, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CitySarajevo,
## Bosnia And Herzegovina, CitySeoul, South Korea, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySibiu, Romania, CitySingapore,
## Singapore, CitySouthampton, United Kingdom, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTampa, FL,
## United States, CityTartu, Estonia, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTucson, AZ, United States, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta, GA,
## United States, CityAuckland, New Zealand, CityBakersfield, CA, United
## States, CityBandung, Indonesia, CityBarcelona, Spain, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBern,
## Switzerland, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChicago,
## IL, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityDelhi, India,
## CityDenver, CO, United States, CityDetroit, MI, United States, CityDhaka,
## Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityDunedin, New Zealand, CityDusseldorf,
## Germany, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHaifa, Israel, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHavana, Cuba, CityHobart, Australia, CityHuntsville, AL, United
## States, CityHyderabad, India, CityIndore, India, CityIstanbul, Turkey,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMississauga, Canada,
## CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNew Orleans, LA, United States, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOrlando, FL, United States, CityOsaka, Japan, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPattaya, Thailand,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhnom Penh,
## Cambodia, CityPhuket, Thailand, CityPlymouth, United Kingdom, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPuebla, Mexico, CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRecife, Brazil, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySan Juan, Puerto Rico,
## CitySan Salvador, El Salvador, CitySanta Barbara, CA, United States,
## CityShanghai, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTel Aviv-Yafo, Israel, CityThane,
## India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTirana, Albania, CityToledo, OH, United States,
## CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVictoria,
## Canada, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWellington, New Zealand, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAsuncion,
## Paraguay, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBanja Luka, Bosnia
## And Herzegovina, CityBarranquilla, Colombia, CityBasel, Switzerland,
## CityBath, United Kingdom, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen,
## Norway, CityBirmingham, United Kingdom, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBremen, Germany, CityBrighton, United
## Kingdom, CityBristol, United Kingdom, CityBrooklyn, NY, United States,
## CityBuenos Aires, Argentina, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCardiff, United Kingdom, CityChandigarh,
## India, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCraiova,
## Romania, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEverett,
## WA, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFlorianopolis, Brazil, CityFort Wayne, IN, United
## States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland,
## CityGeneva, Switzerland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati, India, CityHaifa,
## Israel, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIstanbul, Turkey, CityJersey City, NJ, United States, CityJohor Bahru,
## Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeeds, United Kingdom, CityLeiden, Netherlands, CityLeipzig,
## Germany, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManchester, United Kingdom, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNis, Serbia, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeattle, WA, United States, CityShanghai, China,
## CitySingapore, Singapore, CitySkopje, Macedonia, CitySplit, Croatia,
## CitySpringfield, MO, United States, CityStuttgart, Germany, CitySumy,
## Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged,
## Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL,
## United States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityThiruvananthapuram, India, CityTijuana, Mexico, CityToledo,
## OH, United States, CityToulouse, France, CityTrieste, Italy, CityTucson,
## AZ, United States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityValencia, Spain, CityVancouver, WA, United States,
## CityVienna, Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United
## States, CityVoronezh, Russia, CityWichita, KS, United States, CityWindsor,
## Canada, CityYogyakarta, Indonesia, CityYork, United Kingdom, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl Khobar,
## Saudi Arabia, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityArhus, Denmark, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBaku, Azerbaijan, CityBali,
## Indonesia, CityBarcelona, Spain, CityBarranquilla, Colombia, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasilia, Brazil, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrisbane, Australia, CityBrooklyn, NY, United States, CityBrussels,
## Belgium, CityBuffalo, NY, United States, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChennai, India, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityCuenca, Ecuador, CityDarwin, Australia, CityDelhi, India, CityDenver,
## CO, United States, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFrankfurt, Germany, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati, India,
## CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New Zealand,
## CityHanoi, Vietnam, CityHarare, Zimbabwe, CityHartford, CT, United States,
## CityHeidelberg, Germany, CityHobart, Australia, CityHuntsville, AL, United
## States, CityIndore, India, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan,
## Russia, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran Canaria, Spain,
## CityLas Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLodz, Poland, CityLondon, Canada, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityOdense, Denmark, CityOrlando, FL, United States, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPeterborough, United Kingdom, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPlymouth, United Kingdom,
## CityPort Elizabeth, South Africa, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuebla, Mexico,
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySamara, Russia, CitySan Diego, CA, United States, CitySan
## Jose, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySibiu, Romania, CitySingapore, Singapore, CitySliema,
## Malta, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTehran, Iran, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, Canada, CityVancouver,
## WA, United States, CityVictoria, Canada, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindhoek, Namibia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAccra, Ghana,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlbuquerque, NM, United States,
## CityAlgiers, Algeria, CityAlicante, Spain, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityAustin, TX, United
## States, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA,
## United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBratislava, Slovakia, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurgas, Bulgaria, CityCagliari, Italy, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChisinau,
## Moldova, CityCluj-Napoca, Romania, CityCoimbatore, India, CityColombo,
## Sri Lanka, CityColumbus, OH, United States, CityConstanta, Romania,
## CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI, United States,
## CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville,
## AR, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble, France,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKelowna, Canada,
## CityKitchener, Canada, CityKnoxville, TN, United States, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY,
## United States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMannheim, Germany, CityMarseille, France, CityMedellin, Colombia,
## CityMemphis, TN, United States, CityMexico City, Mexico, CityMilan, Italy,
## CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMinneapolis, MN, United States, CityMonterrey, Mexico, CityMunich,
## Germany, CityNairobi, Kenya, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans, LA, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOshawa, Canada, CityOsijek,
## Croatia, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRiga, Latvia, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySacramento, CA, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySan Juan, Puerto Rico, CitySan
## Salvador, El Salvador, CitySanta Barbara, CA, United States, CitySantiago,
## Chile, CityShanghai, China, CitySingapore, Singapore, CitySpokane, WA,
## United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySydney, Australia, CitySzeged,
## Hungary, CityTacoma, WA, United States, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThane, India, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityTimisoara, Romania, CityToledo, OH, United States, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVarna, Bulgaria, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWichita,
## KS, United States, CityZaragoza (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBelo Horizonte, Brazil, CityBergen, Norway, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrno, Czech Republic, CityBrooklyn, NY, United States, CityBuffalo,
## NY, United States, CityBurlington, Canada, CityCalgary, Canada, CityCali,
## Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharlotte, NC, United
## States, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDallas, TX, United States, CityDavao, Philippines, CityDelhi,
## India, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDublin,
## Ireland, CityDusseldorf, Germany, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGurgaon, India, CityGuwahati,
## India, CityHalifax, Canada, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityHyderabad, India, CityIndore,
## India, CityIrvine, CA, United States, CityJakarta, Indonesia, CityJersey
## City, NJ, United States, CityJohor Bahru, Malaysia, CityKampala, Uganda,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKrasnodar,
## Russia, CityKuala Lumpur, Malaysia, CityLagos, Nigeria, CityLahore,
## Pakistan, CityLas Vegas, NV, United States, CityLeuven, Belgium,
## CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManama, Bahrain, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontreal, Canada, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi
## Mumbai, India, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityNovi Sad, Serbia, CityOdense,
## Denmark, CityOslo, Norway, CityOstrava, Czech Republic, CityOxford,
## United Kingdom, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPeoria, IL,
## United States, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United
## Kingdom, CityRecife, Brazil, CityRed Deer, Canada, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Petersburg, FL, United States, CitySaint Petersburg,
## Russia, CitySalt Lake City, UT, United States, CitySan Diego, CA, United
## States, CitySanta Barbara, CA, United States, CityShanghai, China,
## CitySingapore, Singapore, CityStrasbourg, France, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH,
## United States, CityTrieste, Italy, CityTulsa, OK, United States, CityTurku,
## Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAdelaide, Australia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArlington, TX, United States, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United States,
## CityAuckland, New Zealand, CityBakersfield, CA, United States, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBeirut, Lebanon, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID,
## United States, CityBologna, Italy, CityBonn, Germany, CityBoulder, CO,
## United States, CityBraga, Portugal, CityBrampton, Canada, CityBrasov,
## Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityBurnaby, Canada, CityCairo, Egypt,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDar es Salaam, Tanzania,
## CityDayton, OH, United States, CityDelhi, India, CityDetroit, MI, United
## States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany,
## CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo,
## Finland, CityExeter, United Kingdom, CityFayetteville, AR, United
## States, CityFlorence, Italy, CityFort Myers, FL, United States, CityFort
## Wayne, IN, United States, CityFresno, CA, United States, CityFunchal,
## Portugal, CityGalway, Ireland, CityGdansk, Poland, CityGdynia, Poland,
## CityGlasgow, United Kingdom, CityGothenburg, Sweden, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIasi, Romania, CityIndore, India,
## CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKaohsiung, Taiwan, CityKarachi, Pakistan,
## CityKarlsruhe, Germany, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLos Angeles, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMerida, Mexico,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMississauga, Canada, CityMoncton, Canada, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhuket, Thailand, CityPodgorica, Montenegro, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi
## Arabia, CitySaint Paul, MN, United States, CitySaint Petersburg, Russia,
## CitySan Diego, CA, United States, CitySanta Barbara, CA, United States,
## CitySarajevo, Bosnia And Herzegovina, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CitySofia,
## Bulgaria, CitySouthampton, United Kingdom, CitySt. John's, NL, Canada,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampa, FL, United
## States, CityTashkent, Uzbekistan, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityYekaterinburg,
## Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAbbotsford, Canada,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan,
## CityAnchorage, AK, United States, CityAnkara, Turkey, CityAnn Arbor, MI,
## United States, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAstana, Kazakhstan, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBangalore, India, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBudapest, Hungary, CityBuffalo, NY, United States, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCincinnati, OH, United States, CityCoimbatore,
## India, CityColombo, Sri Lanka, CityColumbus, OH, United States,
## CityCopenhagen, Denmark, CityCoquitlam, Canada, CityCoventry, United
## Kingdom, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityEugene,
## OR, United States, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFort Worth, TX,
## United States, CityFunchal, Portugal, CityGdansk, Poland, CityGdynia,
## Poland, CityGent, Belgium, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHo Chi Minh City, Vietnam, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohannesburg, South
## Africa, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLinz, Austria, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLyon, France, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMinsk, Belarus, CityMonterrey, Mexico, CityMontpellier, France,
## CityMoscow, Russia, CityMumbai, India, CityMysore, India, CityNagpur,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOklahoma City, OK, United States,
## CityOlympia, WA, United States, CityOsaka, Japan, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityPalma de Mallorca, Spain, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRome,
## Italy, CityRotterdam, Netherlands, CitySaint Louis, MO, United States,
## CitySaint Petersburg, Russia, CitySan Diego, CA, United States, CitySanta
## Barbara, CA, United States, CitySanto Domingo, Dominican Republic,
## CitySao Paulo, Brazil, CityShanghai, China, CitySingapore, Singapore,
## CityStockholm, Sweden, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTunis, Tunisia, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna, Austria,
## CityVirginia Beach, VA, United States, CityVoronezh, Russia, CityWarsaw,
## Poland, CityWest Palm Beach, FL, United States, CityWichita, KS, United
## States, CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlexandria, Egypt, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBakersfield,
## CA, United States, CityBarranquilla, Colombia, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBhopal, India, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United Kingdom,
## CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityBursa, Turkey, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCork, Ireland, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityDumaguete,
## Philippines, CityDurban, South Africa, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGainesville, FL, United States, CityGdansk, Poland, CityGdynia,
## Poland, CityGlasgow, United Kingdom, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamburg, Germany, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United
## States, CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville,
## AL, United States, CityIndore, India, CityJacksonville, FL, United States,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKharkiv, Ukraine,
## CityKingston, Jamaica, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeicester, United Kingdom, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLong Beach, CA,
## United States, CityLouisville, KY, United States, CityLubbock, TX, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMiami, FL, United States, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNashville,
## TN, United States, CityNavi Mumbai, India, CityNew York, NY, United
## States, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNovosibirsk, Russia, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPetaling Jaya, Malaysia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPortland, ME, United States, CityPorto, Portugal,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPuerto Vallarta,
## Mexico, CityPune, India, CityQuebec City, Canada, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityRabat, Morocco, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReykjavik, Iceland, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySeville (Sevilla), Spain, CityShanghai, China,
## CityShenzhen, China, CitySingapore, Singapore, CityStuttgart, Germany,
## CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United Kingdom,
## CitySyracuse, NY, United States, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWroclaw, Poland,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAalborg, Denmark, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArad,
## Romania, CityAsheville, NC, United States, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBern, Switzerland, CityBirmingham, AL, United
## States, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBoston, MA, United States, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGreensboro,
## NC, United States, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHanover, Germany, CityHartford, CT, United States, CityHavana, Cuba,
## CityHobart, Australia, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaliningrad, Russia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKochi, India, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas,
## NV, United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLudhiana,
## India, CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMilan, Italy, CityMilton Keynes, United
## Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityMontevideo, Uruguay, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNavi Mumbai, India, CityNewcastle upon Tyne, United Kingdom,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOdessa, Ukraine, CityOradea,
## Romania, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPanama City, Panama, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia,
## PA, United States, CityPhuket, Thailand, CityPort of Spain, Trinidad
## And Tobago, CityPortland, ME, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPretoria,
## South Africa, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRio de Janeiro, Brazil, CityRiyadh, Saudi Arabia, CityRochester, NY,
## United States, CitySaint Petersburg, Russia, CitySalem, OR, United States,
## CitySan Diego, CA, United States, CitySan Francisco, CA, United States,
## CitySanta Barbara, CA, United States, CityShanghai, China, CitySingapore,
## Singapore, CityStuttgart, Germany, CitySumy, Ukraine, CitySurabaya,
## Indonesia, CitySurat, India, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste, Italy,
## CityTrondheim, Norway, CityTurin, Italy, CityUlaanbaatar, Mongolia,
## CityUppsala, Sweden, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia Beach,
## VA, United States, CityVoronezh, Russia, CityWashington, DC, United States,
## CityWellington, New Zealand, CityWichita, KS, United States, CityWinnipeg,
## Canada, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAberdeen, United Kingdom,
## CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAmman,
## Jordan, CityAnchorage, AK, United States, CityAnkara, Turkey, CityAntwerp,
## Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBandar Seri Begawan,
## Brunei, CityBangkok, Thailand, CityBarranquilla, Colombia, CityBarrie,
## Canada, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBerkeley, CA,
## United States, CityBhubaneswar, India, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBucharest, Romania, CityBuffalo, NY, United
## States, CityCalgary, Canada, CityCali, Colombia, CityCambridge, United
## Kingdom, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityCebu, Philippines, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCleveland, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDebrecen, Hungary,
## CityDelhi, India, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityEdinburgh, United Kingdom, CityEdmonton, Canada, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States,
## CityFort Wayne, IN, United States, CityFunchal, Portugal, CityGdansk,
## Poland, CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada,
## Spain, CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou,
## China, CityGuatemala City, Guatemala, CityGuwahati, India, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrbil, Iraq,
## CityIslamabad, Pakistan, CityJersey City, NJ, United States, CityJohor
## Bahru, Malaysia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas,
## Lithuania, CityKazan, Russia, CityKingston, Canada, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLimassol,
## Cyprus, CityLimerick, Ireland, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLiverpool, United Kingdom, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLublin,
## Poland, CityLudhiana, India, CityLugano, Switzerland, CityLuxembourg,
## Luxembourg, CityLviv, Ukraine, CityLyon, France, CityMakati, Philippines,
## CityMalaga, Spain, CityMale, Maldives, CityMalmo, Sweden, CityMangalore,
## India, CityManila, Philippines, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityNuremberg, Germany, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortland, OR, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune,
## India, CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySaskatoon, Canada, CityShanghai, China, CitySharjah,
## United Arab Emirates, CitySingapore, Singapore, CityStavanger, Norway,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityTokyo,
## Japan, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVisakhapatnam, India, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBaltimore, MD, United
## States, CityBarranquilla, Colombia, CityBeijing, China, CityBelfast,
## United Kingdom, CityBellevue, WA, United States, CityBellingham, WA,
## United States, CityBergen, Norway, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBordeaux,
## France, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBydgoszcz, Poland, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCape Town, South Africa, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChiang Mai, Thailand, CityChicago, IL, United States,
## CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityCuritiba, Brazil, CityDelhi, India,
## CityDerby, United Kingdom, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHouston, TX, United States, CityHuntsville, AL, United
## States, CityIndore, India, CityIzmir, Turkey, CityJaipur, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKansas City, MO, United States, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan,
## CityLas Vegas, NV, United States, CityLeuven, Belgium, CityLille, France,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht, Netherlands,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo, Italy,
## CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhoenix, AZ, United States,
## CityPhuket, Thailand, CityPittsburgh, PA, United States, CityPlovdiv,
## Bulgaria, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityReno, NV, United States, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CityRostov-
## na-donu, Russia, CitySaint Petersburg, Russia, CitySan Antonio, TX,
## United States, CitySan Diego, CA, United States, CitySan Jose, Costa
## Rica, CitySanta Barbara, CA, United States, CitySanta Cruz de Tenerife,
## Spain, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTampere, Finland, CityTel Aviv-
## Yafo, Israel, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityToronto,
## Canada, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAccra, Ghana, CityAd
## Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India,
## CityAlbany, NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAsuncion, Paraguay, CityAthens, Greece, CityAtlanta,
## GA, United States, CityAuckland, New Zealand, CityBakersfield, CA,
## United States, CityBaku, Azerbaijan, CityBaltimore, MD, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBoston, MA, United States, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBucharest, Romania, CityBuenos Aires, Argentina,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun,
## Mexico, CityCardiff, United Kingdom, CityChattanooga, TN, United
## States, CityChelyabinsk, Russia, CityChengdu, China, CityCluj-Napoca,
## Romania, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus,
## OH, United States, CityCopenhagen, Denmark, CityDelhi, India, CityDerby,
## United Kingdom, CityDetroit, MI, United States, CityDnipro, Ukraine,
## CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab Emirates,
## CityDublin, Ireland, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuadalajara, Mexico,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHamilton, New
## Zealand, CityHanoi, Vietnam, CityHanover, Germany, CityHartford, CT,
## United States, CityHavana, Cuba, CityHelsinki, Finland, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityIrbil, Iraq, CityIslamabad, Pakistan, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKitchener, Canada, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLouisville, KY, United States, CityLubbock,
## TX, United States, CityLucknow (Lakhnau), India, CityLudhiana, India,
## CityLuxembourg, Luxembourg, CityLyon, France, CityMale, Maldives,
## CityMalmo, Sweden, CityManila, Philippines, CityMarseille, France,
## CityMedellin, Colombia, CityMerida, Mexico, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMoscow, Russia, CityNanaimo, BC, Canada, CityNaples, Italy,
## CityNashville, TN, United States, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityNuremberg, Germany, CityOdense, Denmark, CityOsaka, Japan, CityOshawa,
## Canada, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuito,
## Ecuador, CityReading, United Kingdom, CityRegina, Canada, CityReykjavik,
## Iceland, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRochester, NY, United States, CitySacramento, CA, United
## States, CitySaint Petersburg, Russia, CitySan Diego, CA, United States,
## CitySan Jose, Costa Rica, CitySanta Barbara, CA, United States, CitySanto
## Domingo, Dominican Republic, CitySao Paulo, Brazil, CityShanghai, China,
## CitySharjah, United Arab Emirates, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityTrondheim, Norway, CityTucson, AZ, United
## States, CityUlaanbaatar, Mongolia, CityUppsala, Sweden, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWellington, New Zealand, CityWichita, KS, United States,
## CityYerevan, Armenia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAalborg,
## Denmark, CityAbbotsford, Canada, CityAd Dammam, Saudi Arabia, CityAddis
## Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States,
## CityAlbuquerque, NM, United States, CityAlmaty, Kazakhstan, CityAnchorage,
## AK, United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville,
## NC, United States, CityAthens, Greece, CityAtlanta, GA, United
## States, CityAuckland, New Zealand, CityBakersfield, CA, United States,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBogota, Colombia, CityBoise, ID, United States, CityBologna, Italy,
## CityBonn, Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBrussels, Belgium,
## CityBuffalo, NY, United States, CityBursa, Turkey, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCasablanca, Morocco,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityCork, Ireland, CityDar es
## Salaam, Tanzania, CityDavao, Philippines, CityDayton, OH, United States,
## CityDebrecen, Hungary, CityDelhi, India, CityDetroit, MI, United States,
## CityDnipro, Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai,
## United Arab Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGlasgow, United Kingdom, CityGranada, Spain,
## CityGraz, Austria, CityGroningen, Netherlands, CityGuangzhou, China,
## CityGuatemala City, Guatemala, CityGuayaquil, Ecuador, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHeidelberg, Germany, CityHobart,
## Australia, CityHuntsville, AL, United States, CityHyderabad, India,
## CityIndianapolis, IN, United States, CityIndore, India, CityIrvine, CA,
## United States, CityJacksonville, FL, United States, CityJersey City,
## NJ, United States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan,
## CityKaunas, Lithuania, CityKazan, Russia, CityKingston, Jamaica,
## CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos,
## Nigeria, CityLahore, Pakistan, CityLarnaca, Cyprus, CityLas Vegas, NV,
## United States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLimerick,
## Ireland, CityLisbon, Portugal, CityLittle Rock, AR, United States,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon,
## France, CityMale, Maldives, CityMalmo, Sweden, CityManila, Philippines,
## CityMarseille, France, CityMedellin, Colombia, CityMilan, Italy, CityMilton
## Keynes, United Kingdom, CityMilwaukee, WI, United States, CityMonterrey,
## Mexico, CityMunich, Germany, CityNairobi, Kenya, CityNanaimo, BC,
## Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOakland, CA, United States, CityOdense, Denmark, CityOlomouc, Czech
## Republic, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPittsburgh, PA, United States, CityPlymouth, United
## Kingdom, CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPuebla, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityRabat, Morocco, CityReading, United
## Kingdom, CityRegina, Canada, CityRichmond, VA, United States, CityRijeka,
## Croatia, CityRiyadh, Saudi Arabia, CityRotterdam, Netherlands, CitySaint
## Paul, MN, United States, CitySaint Petersburg, Russia, CitySan Diego, CA,
## United States, CitySanta Barbara, CA, United States, CitySeville (Sevilla),
## Spain, CityShanghai, China, CityShenzhen, China, CitySingapore, Singapore,
## CitySplit, Croatia, CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey,
## Canada, CitySwindon, United Kingdom, CitySzeged, Hungary, CityTacoma, WA,
## United States, CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee,
## FL, United States, CityTampa, FL, United States, CityThe Hague (Den Haag),
## Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo,
## OH, United States, CityTrieste, Italy, CityTunis, Tunisia, CityTurin,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVisakhapatnam, India, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY, United
## States, CityAlmaty, Kazakhstan, CityAmman, Jordan, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAntwerp, Belgium, CityArlington,
## TX, United States, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBali, Indonesia, CityBandung,
## Indonesia, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBerkeley, CA, United States, CityBogota, Colombia,
## CityBoise, ID, United States, CityBologna, Italy, CityBonn, Germany,
## CityBoulder, CO, United States, CityBraga, Portugal, CityBrasov, Romania,
## CityBrighton, United Kingdom, CityBrisbane, Australia, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityBydgoszcz, Poland,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityChennai, India, CityChisinau, Moldova, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityConstanta,
## Romania, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDusseldorf, Germany,
## CityEdinburgh, United Kingdom, CityEindhoven, Netherlands, CityEspoo,
## Finland, CityEugene, OR, United States, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow,
## United Kingdom, CityGranada, Spain, CityGraz, Austria, CityGrenoble,
## France, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India, CityJersey
## City, NJ, United States, CityJerusalem, Israel, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKarlsruhe, Germany, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKnoxville, TN, United States,
## CityKochi, India, CityKolkata, India, CityKosice, Slovakia, CityKota
## Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeuven,
## Belgium, CityLima, Peru, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLiverpool, United Kingdom,
## CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityManama, Bahrain, CityManila,
## Philippines, CityMaribor, Slovenia, CityMarseille, France, CityMedellin,
## Colombia, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMinsk, Belarus, CityMississauga,
## Canada, CityMonterrey, Mexico, CityMontpellier, France, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPort of Spain, Trinidad And Tobago, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRecife, Brazil, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySalt Lake City, UT, United States, CitySan Diego,
## CA, United States, CitySanta Barbara, CA, United States, CityShanghai,
## China, CitySibiu, Romania, CitySingapore, Singapore, CitySouthampton,
## United Kingdom, CitySpokane, WA, United States, CityStrasbourg, France,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzczecin, Poland, CitySzeged, Hungary, CityTaichung,
## Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## Canada, CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityZagreb, Croatia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAbu Dhabi,
## United Arab Emirates, CityAd Dammam, Saudi Arabia, CityAddis Ababa,
## Ethiopia, CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBanja Luka, Bosnia And Herzegovina,
## CityBarranquilla, Colombia, CityBath, United Kingdom, CityBelfast, United
## Kingdom, CityBellevue, WA, United States, CityBellingham, WA, United
## States, CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY,
## United States, CityBuffalo, NY, United States, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCardiff, United Kingdom, CityCharleston, SC,
## United States, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCoquitlam,
## Canada, CityCraiova, Romania, CityCuritiba, Brazil, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityEverett, WA, United States,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Wayne, IN, United States, CityFunchal, Portugal, CityGdansk, Poland,
## CityGdynia, Poland, CityGenoa, Italy, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGrand Rapids, MI, United States, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHalifax, Canada, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHarare, Zimbabwe,
## CityHartford, CT, United States, CityHobart, Australia, CityHouston,
## TX, United States, CityHuntsville, AL, United States, CityIndore,
## India, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKaohsiung, Taiwan, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Palmas de Gran
## Canaria, Spain, CityLas Vegas, NV, United States, CityLeipzig, Germany,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLinz, Austria, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLodz, Poland, CityLondon, Canada, CityLouisville, KY, United States,
## CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMale, Maldives, CityMalmo, Sweden, CityMangalore, India, CityManila,
## Philippines, CityMannheim, Germany, CityMarseille, France, CityMedellin,
## Colombia, CityMelbourne, Australia, CityMilan, Italy, CityMilton Keynes,
## United Kingdom, CityMilwaukee, WI, United States, CityMonterrey, Mexico,
## CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai, India,
## CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny
## Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham, United
## Kingdom, CityNovi Sad, Serbia, CityOdense, Denmark, CityOlympia, WA, United
## States, CityOradea, Romania, CityOslo, Norway, CityOstrava, Czech Republic,
## CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis,
## France, CityPerth, Australia, CityPhiladelphia, PA, United States,
## CityPhuket, Thailand, CityPlovdiv, Bulgaria, CityPodgorica, Montenegro,
## CityPortland, ME, United States, CityPortsmouth, United Kingdom,
## CityPoznan, Poland, CityPrague, Czech Republic, CityPristina, Kosovo
## (Disputed Territory), CityPune, India, CityQueretaro, Mexico, CityQuezon
## City, Philippines, CityQuito, Ecuador, CityRamat Gan, Israel, CityReading,
## United Kingdom, CityRegina, Canada, CityReno, NV, United States,
## CityRichmond, VA, United States, CityRijeka, Croatia, CityRio de Janeiro,
## Brazil, CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySanta Barbara, CA, United States, CitySanta
## Rosa, CA, United States, CityShanghai, China, CitySheffield, United
## Kingdom, CitySingapore, Singapore, CitySofia, Bulgaria, CitySpringfield,
## MO, United States, CityStuttgart, Germany, CitySumy, Ukraine, CitySurat,
## India, CitySurrey, Canada, CitySwindon, United Kingdom, CitySyracuse,
## NY, United States, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTampere, Finland, CityThe
## Hague (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana,
## Mexico, CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA,
## United States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWinnipeg, Canada,
## CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAberdeen,
## United Kingdom, CityAd Dammam, Saudi Arabia, CityAddis Ababa, Ethiopia,
## CityAhmedabad, India, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityBaghdad,
## Iraq, CityBakersfield, CA, United States, CityBarcelona, Spain,
## CityBarranquilla, Colombia, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBerlin, Germany, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBordeaux, France, CityBraga,
## Portugal, CityBrampton, Canada, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityBurlington, VT, United States, CityCairo, Egypt, CityCalgary, Canada,
## CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra, Australia,
## CityCancun, Mexico, CityCaracas, Venezuela, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbia, SC,
## United States, CityColumbus, OH, United States, CityCopenhagen, Denmark,
## CityDallas, TX, United States, CityDelhi, India, CityDenver, CO, United
## States, CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha,
## Qatar, CityDresden, Germany, CityDubai, United Arab Emirates, CityDurban,
## South Africa, CityEdinburgh, United Kingdom, CityEspoo, Finland,
## CityExeter, United Kingdom, CityFayetteville, AR, United States, CityFort
## Myers, FL, United States, CityFort Wayne, IN, United States, CityFunchal,
## Portugal, CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United
## Kingdom, CityGothenburg, Sweden, CityGranada, Spain, CityGraz, Austria,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHo Chi
## Minh City, Vietnam, CityHobart, Australia, CityHonolulu, HI, United States,
## CityHuntsville, AL, United States, CityIndore, India, CityInnsbruck,
## Austria, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKiev,
## Ukraine, CityKitchener, Canada, CityKolkata, India, CityKosice, Slovakia,
## CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland, CityKuala Lumpur,
## Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV,
## United States, CityLeeds, United Kingdom, CityLeuven, Belgium, CityLille,
## France, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR,
## United States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville,
## KY, United States, CityLudhiana, India, CityLuxembourg, Luxembourg,
## CityLviv, Ukraine, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMuscat, Oman, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNew Orleans,
## LA, United States, CityNew York, NY, United States, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNizhny Novgorod,
## Russia, CityNorwich, United Kingdom, CityNottingham, United Kingdom,
## CityOdense, Denmark, CityOdessa, Ukraine, CityOsijek, Croatia, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPenang, Malaysia,
## CityPerth, Australia, CityPhiladelphia, PA, United States, CityPhuket,
## Thailand, CityPort Elizabeth, South Africa, CityPortland, ME, United
## States, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPretoria, South Africa, CityPristina, Kosovo (Disputed
## Territory), CityPuerto Vallarta, Mexico, CityPune, India, CityQueretaro,
## Mexico, CityQuito, Ecuador, CityReading, United Kingdom, CityRegina,
## Canada, CityRichmond, VA, United States, CityRijeka, Croatia, CityRiyadh,
## Saudi Arabia, CityRome, Italy, CitySaint Petersburg, Russia, CitySan
## Diego, CA, United States, CitySan Salvador, El Salvador, CitySanta
## Barbara, CA, United States, CityShanghai, China, CitySingapore, Singapore,
## CityStuttgart, Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon,
## United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei,
## Taiwan, CityTallahassee, FL, United States, CityTashkent, Uzbekistan,
## CityThane, India, CityThe Hague (Den Haag), Netherlands, CityThessaloniki,
## Greece, CityTijuana, Mexico, CityToledo, OH, United States, CityTrieste,
## Italy, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityValencia, Spain, CityVancouver, WA, United States, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBarrie, Canada, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBern, Switzerland, CityBogota, Colombia, CityBoise, ID, United
## States, CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBristol, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United
## States, CityBurlington, Canada, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityChandigarh, India, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityCleveland,
## OH, United States, CityCoimbatore, India, CityColombo, Sri Lanka,
## CityColumbus, OH, United States, CityCopenhagen, Denmark, CityCuenca,
## Ecuador, CityDelhi, India, CityDes Moines, IA, United States, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityDumaguete, Philippines,
## CityDunedin, New Zealand, CityEdinburgh, United Kingdom, CityEl Paso,
## TX, United States, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFlorence, Italy, CityFort Wayne,
## IN, United States, CityFresno, CA, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGoa, India, CityGranada, Spain, CityGraz, Austria, CityGroningen,
## Netherlands, CityGuangzhou, China, CityGuatemala City, Guatemala,
## CityGuwahati, India, CityHamilton, Bermuda, CityHamilton, Canada,
## CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart, Australia,
## CityHuntsville, AL, United States, CityIndore, India, CityJaipur,
## India, CityJeddah (Jiddah), Saudi Arabia, CityJersey City, NJ, United
## States, CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas,
## Lithuania, CityKazan, Russia, CityKharkiv, Ukraine, CityKingston, Canada,
## CityKitchener, Canada, CityKlaipeda, Lithuania, CityKolkata, India,
## CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow),
## Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLong Beach, CA, United States, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadrid, Spain, CityMakati, Philippines, CityMalaga, Spain, CityMale,
## Maldives, CityMalmo, Sweden, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMiami, FL, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United States,
## CityMoncton, Canada, CityMonterrey, Mexico, CityMumbai, India, CityMysore,
## India, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava, Czech
## Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPhiladelphia, PA, United
## States, CityPhnom Penh, Cambodia, CityPhuket, Thailand, CityPortland, ME,
## United States, CityPortland, OR, United States, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQuebec City, Canada,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityRaleigh, NC, United
## States, CityReading, United Kingdom, CityRegina, Canada, CityRichmond, VA,
## United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySarajevo, Bosnia And Herzegovina, CityShanghai,
## China, CitySingapore, Singapore, CityStuttgart, Germany, CitySumy, Ukraine,
## CitySurrey, Canada, CitySwindon, United Kingdom, CitySzeged, Hungary,
## CityTaichung, Taiwan, CityTaipei, Taiwan, CityTallahassee, FL, United
## States, CityTbilisi, Georgia, CityTel Aviv-Yafo, Israel, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityTulsa, OK, United
## States, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara,
## India, CityVancouver, WA, United States, CityVictoria, Canada, CityVienna,
## Austria, CityVirginia Beach, VA, United States, CityVoronezh, Russia,
## CityWest Palm Beach, FL, United States, CityWichita, KS, United States,
## CityWroclaw, Poland, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United
## States, CityAnkara, Turkey, CityAntalya, Turkey, CityAntwerp, Belgium,
## CityAsheville, NC, United States, CityAstana, Kazakhstan, CityAthens,
## Greece, CityAtlanta, GA, United States, CityAuckland, New Zealand,
## CityBakersfield, CA, United States, CityBangalore, India, CityBarranquilla,
## Colombia, CityBeirut, Lebanon, CityBelfast, United Kingdom, CityBellevue,
## WA, United States, CityBellingham, WA, United States, CityBergen, Norway,
## CityBhubaneswar, India, CityBirmingham, United Kingdom, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrno, Czech Republic, CityBrooklyn, NY, United States,
## CityBuffalo, NY, United States, CityCagliari, Italy, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCampinas,
## Brazil, CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United
## Kingdom, CityChattanooga, TN, United States, CityChelyabinsk, Russia,
## CityChengdu, China, CityChristchurch, New Zealand, CityCoimbatore, India,
## CityCologne, Germany, CityColombo, Sri Lanka, CityColumbus, OH, United
## States, CityCopenhagen, Denmark, CityDarwin, Australia, CityDelhi, India,
## CityDetroit, MI, United States, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEspoo, Finland, CityExeter, United Kingdom,
## CityFayetteville, AR, United States, CityFort Wayne, IN, United States,
## CityFunchal, Portugal, CityGainesville, FL, United States, CityGdansk,
## Poland, CityGdynia, Poland, CityGeneva, Switzerland, CityGlasgow,
## United Kingdom, CityGold Coast, Australia, CityGranada, Spain, CityGraz,
## Austria, CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala
## City, Guatemala, CityGuwahati, India, CityHaifa, Israel, CityHamilton,
## Bermuda, CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT,
## United States, CityHobart, Australia, CityHuntsville, AL, United States,
## CityIasi, Romania, CityIndore, India, CityJersey City, NJ, United States,
## CityJohannesburg, South Africa, CityJohor Bahru, Malaysia, CityKaliningrad,
## Russia, CityKarachi, Pakistan, CityKathmandu, Nepal, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United
## States, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal,
## CityLittle Rock, AR, United States, CityLjubljana, Slovenia, CityLondon,
## Canada, CityLouisville, KY, United States, CityLudhiana, India, CityLugano,
## Switzerland, CityLuxembourg, Luxembourg, CityLyon, France, CityMaastricht,
## Netherlands, CityMale, Maldives, CityMalmo, Sweden, CityManila,
## Philippines, CityMarseille, France, CityMedellin, Colombia, CityMexico
## City, Mexico, CityMilan, Italy, CityMilton Keynes, United Kingdom,
## CityMilwaukee, WI, United States, CityMonterrey, Mexico, CityMontevideo,
## Uruguay, CityNagpur, India, CityNanaimo, BC, Canada, CityNantes, France,
## CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle upon Tyne,
## United Kingdom, CityNewcastle, Australia, CityNice, France, CityNicosia,
## Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United Kingdom,
## CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo, Norway,
## CityOstrava, Czech Republic, CityOxford, United Kingdom, CityPadova, Italy,
## CityPalermo, Italy, CityPanama City, Panama, CityParamaribo, Suriname,
## CityParis, France, CityPerth, Australia, CityPeterborough, United Kingdom,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRed Deer, Canada, CityRegina, Canada, CityRichmond,
## VA, United States, CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint
## Petersburg, Russia, CitySan Diego, CA, United States, CitySanta Barbara,
## CA, United States, CitySanta Cruz de Tenerife, Spain, CityShanghai, China,
## CitySingapore, Singapore, CitySt. John's, NL, Canada, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySuzhou, China,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityToronto, Canada, CityTrieste, Italy,
## CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands, CityVadodara, India,
## CityVancouver, WA, United States, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWarsaw, Poland,
## CityWashington, DC, United States, CityWichita, KS, United States,
## CityYork, United Kingdom, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany,
## NY, United States, CityAlexandria, Egypt, CityAlgiers, Algeria,
## CityAlmaty, Kazakhstan, CityAmsterdam, Netherlands, CityAnchorage, AK,
## United States, CityAnkara, Turkey, CityAnn Arbor, MI, United States,
## CityAntwerp, Belgium, CityArad, Romania, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBangkok, Thailand,
## CityBarranquilla, Colombia, CityBasel, Switzerland, CityBeijing,
## China, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBelo Horizonte, Brazil, CityBergen,
## Norway, CityBogota, Colombia, CityBoise, ID, United States, CityBologna,
## Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasilia, Brazil,
## CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn, NY, United
## States, CityBuffalo, NY, United States, CityBurnaby, Canada, CityCalgary,
## Canada, CityCali, Colombia, CityCambridge, United Kingdom, CityCanberra,
## Australia, CityCancun, Mexico, CityCape Town, South Africa, CityCardiff,
## United Kingdom, CityChattanooga, TN, United States, CityChelyabinsk,
## Russia, CityChengdu, China, CityCoimbatore, India, CityCoimbra, Portugal,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityDelhi, India, CityDetroit, MI, United States, CityDnipro,
## Ukraine, CityDoha, Qatar, CityDresden, Germany, CityDubai, United Arab
## Emirates, CityEdinburgh, United Kingdom, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFlorianopolis,
## Brazil, CityFort Wayne, IN, United States, CityFrankfurt, Germany,
## CityFunchal, Portugal, CityGalway, Ireland, CityGdansk, Poland,
## CityGdynia, Poland, CityGent, Belgium, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityIzmir, Turkey, CityJakarta,
## Indonesia, CityJersey City, NJ, United States, CityJohor Bahru, Malaysia,
## CityKarachi, Pakistan, CityKatowice, Poland, CityKaunas, Lithuania,
## CityKazan, Russia, CityKelowna, Canada, CityKitchener, Canada, CityKolkata,
## India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia, CityKrakow
## (Cracow), Poland, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLausanne, Switzerland, CityLeuven, Belgium,
## CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle Rock, AR, United
## States, CityLjubljana, Slovenia, CityLondon, Canada, CityLouisville, KY,
## United States, CityLublin, Poland, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityMontreal, Canada, CityNanaimo,
## BC, Canada, CityNaples, Italy, CityNavi Mumbai, India, CityNewcastle,
## Australia, CityNice, France, CityNicosia, Cyprus, CityNis, Serbia,
## CityNizhny Novgorod, Russia, CityNoida, India, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityOttawa, Canada, CityPadova,
## Italy, CityPalermo, Italy, CityParamaribo, Suriname, CityParis, France,
## CityPeoria, IL, United States, CityPerth, Australia, CityPetaling Jaya,
## Malaysia, CityPhiladelphia, PA, United States, CityPhoenix, AZ, United
## States, CityPhuket, Thailand, CityPortland, ME, United States, CityPorto,
## Portugal, CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague,
## Czech Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySan Diego,
## CA, United States, CitySan Juan, Puerto Rico, CitySanta Barbara, CA,
## United States, CitySaskatoon, Canada, CityShanghai, China, CitySingapore,
## Singapore, CitySliema, Malta, CityStockholm, Sweden, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySydney, Australia, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityThe Hague
## (Den Haag), Netherlands, CityThessaloniki, Greece, CityTijuana, Mexico,
## CityToledo, OH, United States, CityTrieste, Italy, CityUlaanbaatar,
## Mongolia, CityUtrecht, Netherlands, CityVadodara, India, CityVancouver,
## WA, United States, CityVarna, Bulgaria, CityVienna, Austria, CityVirginia
## Beach, VA, United States, CityVoronezh, Russia, CityWichita, KS, United
## States, CityWindsor, Canada, CityYogyakarta, Indonesia, CityZaragoza
## (Saragossa), Spain, CityZurich, Switzerland
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam,
## Saudi Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAl
## Khobar, Saudi Arabia, CityAlbany, NY, United States, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityArhus, Denmark, CityAsheville, NC, United States,
## CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland, New
## Zealand, CityBakersfield, CA, United States, CityBarranquilla, Colombia,
## CityBelfast, United Kingdom, CityBelgrade, Serbia, CityBellevue, WA, United
## States, CityBellingham, WA, United States, CityBergen, Norway, CityBhopal,
## India, CityBirmingham, AL, United States, CityBogota, Colombia, CityBoise,
## ID, United States, CityBologna, Italy, CityBonn, Germany, CityBraga,
## Portugal, CityBrasov, Romania, CityBrighton, United Kingdom, CityBrooklyn,
## NY, United States, CityBuffalo, NY, United States, CityBurgas, Bulgaria,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityCharlotte, NC, United States, CityChattanooga, TN, United States,
## CityChelyabinsk, Russia, CityChengdu, China, CityCoimbatore, India,
## CityColombo, Sri Lanka, CityColumbus, OH, United States, CityCopenhagen,
## Denmark, CityCoventry, United Kingdom, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGreensboro, NC, United States,
## CityGroningen, Netherlands, CityGuangzhou, China, CityGuatemala City,
## Guatemala, CityGuwahati, India, CityHamilton, Bermuda, CityHamilton,
## Canada, CityHanoi, Vietnam, CityHartford, CT, United States, CityHobart,
## Australia, CityHuntsville, AL, United States, CityIndore, India,
## CityJersey City, NJ, United States, CityJohor Bahru, Malaysia, CityKarachi,
## Pakistan, CityKaunas, Lithuania, CityKazan, Russia, CityKitchener, Canada,
## CityKolkata, India, CityKosice, Slovakia, CityKota Kinabalu, Malaysia,
## CityKrakow (Cracow), Poland, CityKrasnodar, Russia, CityLagos, Nigeria,
## CityLahore, Pakistan, CityLas Vegas, NV, United States, CityLeiden,
## Netherlands, CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon,
## Portugal, CityLittle Rock, AR, United States, CityLjubljana, Slovenia,
## CityLondon, Canada, CityLondon, United Kingdom, CityLouisville, KY, United
## States, CityLudhiana, India, CityLuxembourg, Luxembourg, CityLyon, France,
## CityMadison, WI, United States, CityMale, Maldives, CityMalmo, Sweden,
## CityManchester, United Kingdom, CityManila, Philippines, CityMarseille,
## France, CityMedellin, Colombia, CityMemphis, TN, United States, CityMilan,
## Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI, United
## States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice,
## France, CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich,
## United Kingdom, CityNottingham, United Kingdom, CityNovosibirsk, Russia,
## CityOdense, Denmark, CityOklahoma City, OK, United States, CityOrlando, FL,
## United States, CityOslo, Norway, CityOstrava, Czech Republic, CityPadova,
## Italy, CityPalermo, Italy, CityPalma de Mallorca, Spain, CityParamaribo,
## Suriname, CityParis, France, CityPattaya, Thailand, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPorto Alegre, Brazil, CityPortsmouth, United
## Kingdom, CityPoznan, Poland, CityPrague, Czech Republic, CityPristina,
## Kosovo (Disputed Territory), CityPune, India, CityQueretaro, Mexico,
## CityQuito, Ecuador, CityReading, United Kingdom, CityRegina, Canada,
## CityRichmond, VA, United States, CityRiga, Latvia, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CitySaint Petersburg, Russia, CitySalem, OR,
## United States, CitySamara, Russia, CitySan Diego, CA, United States,
## CitySan Jose, CA, United States, CitySanta Barbara, CA, United States,
## CitySeattle, WA, United States, CityShanghai, China, CitySingapore,
## Singapore, CitySkopje, Macedonia, CityStavanger, Norway, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityTallinn, Estonia, CityTartu,
## Estonia, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityThiruvananthapuram, India, CityTijuana, Mexico, CityTirana, Albania,
## CityToledo, OH, United States, CityToulouse, France, CityTrieste, Italy,
## CityTurku, Finland, CityUlaanbaatar, Mongolia, CityUtrecht, Netherlands,
## CityVadodara, India, CityVancouver, WA, United States, CityVienna,
## Austria, CityVilnius, Lithuania, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityWindhoek,
## Namibia, CityYekaterinburg, Russia, CityZaragoza (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain

## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19, uniqueCut
## = 10, : These variables have zero variances: CityAd Dammam, Saudi Arabia,
## CityAddis Ababa, Ethiopia, CityAdelaide, Australia, CityAhmedabad,
## India, CityAlbany, NY, United States, CityAlicante, Spain, CityAlmaty,
## Kazakhstan, CityAnchorage, AK, United States, CityAnkara, Turkey,
## CityAntwerp, Belgium, CityAsheville, NC, United States, CityAthens, Greece,
## CityAtlanta, GA, United States, CityAuckland, New Zealand, CityAustin,
## TX, United States, CityBakersfield, CA, United States, CityBandar Seri
## Begawan, Brunei, CityBarranquilla, Colombia, CityBelfast, United Kingdom,
## CityBellevue, WA, United States, CityBellingham, WA, United States,
## CityBergen, Norway, CityBogota, Colombia, CityBoise, ID, United States,
## CityBologna, Italy, CityBonn, Germany, CityBraga, Portugal, CityBrasov,
## Romania, CityBratislava, Slovakia, CityBremen, Germany, CityBrighton,
## United Kingdom, CityBrooklyn, NY, United States, CityBudapest, Hungary,
## CityBuffalo, NY, United States, CityCalgary, Canada, CityCali, Colombia,
## CityCambridge, United Kingdom, CityCanberra, Australia, CityCancun, Mexico,
## CityCardiff, United Kingdom, CityCebu, Philippines, CityChattanooga, TN,
## United States, CityChelyabinsk, Russia, CityChengdu, China, CityChiang
## Mai, Thailand, CityChicago, IL, United States, CityCincinnati, OH, United
## States, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit, MI,
## United States, CityDhaka, Bangladesh, CityDnipro, Ukraine, CityDoha, Qatar,
## CityDresden, Germany, CityDubai, United Arab Emirates, CityEdinburgh,
## United Kingdom, CityEdmonton, Canada, CityEspoo, Finland, CityExeter,
## United Kingdom, CityFayetteville, AR, United States, CityFort Wayne, IN,
## United States, CityFort Worth, TX, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGurgaon,
## India, CityGuwahati, India, CityHamburg, Germany, CityHamilton, Bermuda,
## CityHamilton, Canada, CityHanoi, Vietnam, CityHartford, CT, United States,
## CityHobart, Australia, CityHong Kong, Hong Kong, CityHuntsville, AL, United
## States, CityIndore, India, CityIstanbul, Turkey, CityJersey City, NJ,
## United States, CityJohor Bahru, Malaysia, CityKampala, Uganda, CityKansas
## City, MO, United States, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityKuching, Malaysia, CityLagos, Nigeria, CityLahore, Pakistan, CityLas
## Vegas, NV, United States, CityLeicester, United Kingdom, CityLeuven,
## Belgium, CityLexington, KY, United States, CityLimassol, Cyprus,
## CityLisbon, Portugal, CityLittle Rock, AR, United States, CityLjubljana,
## Slovenia, CityLondon, Canada, CityLos Angeles, CA, United States,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee,
## WI, United States, CityMinneapolis, MN, United States, CityMonterrey,
## Mexico, CityNanaimo, BC, Canada, CityNaples, Italy, CityNavi Mumbai,
## India, CityNewcastle, Australia, CityNice, France, CityNicosia, Cyprus,
## CityNizhny Novgorod, Russia, CityNorwich, United Kingdom, CityNottingham,
## United Kingdom, CityOdense, Denmark, CityOslo, Norway, CityOstrava,
## Czech Republic, CityPadova, Italy, CityPalermo, Italy, CityParamaribo,
## Suriname, CityParis, France, CityPerth, Australia, CityPhiladelphia, PA,
## United States, CityPhuket, Thailand, CityPortland, ME, United States,
## CityPortsmouth, United Kingdom, CityPoznan, Poland, CityPrague, Czech
## Republic, CityPristina, Kosovo (Disputed Territory), CityPune, India,
## CityQueretaro, Mexico, CityQuito, Ecuador, CityReading, United Kingdom,
## CityRegina, Canada, CityRichmond, VA, United States, CityRijeka, Croatia,
## CityRiyadh, Saudi Arabia, CityRostov-na-donu, Russia, CitySaint Louis,
## MO, United States, CitySaint Petersburg, FL, United States, CitySaint
## Petersburg, Russia, CitySan Antonio, TX, United States, CitySan Diego, CA,
## United States, CitySan Francisco, CA, United States, CitySanta Barbara,
## CA, United States, CitySantiago, Chile, CitySelangor, Malaysia, CitySeoul,
## South Korea, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurabaya, Indonesia, CitySurrey, Canada,
## CitySwindon, United Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan,
## CityTaipei, Taiwan, CityTallahassee, FL, United States, CityTehran,
## Iran, CityThe Hague (Den Haag), Netherlands, CityThessaloniki, Greece,
## CityTijuana, Mexico, CityTimisoara, Romania, CityTokyo, Japan, CityToledo,
## OH, United States, CityTrieste, Italy, CityUlaanbaatar, Mongolia,
## CityUtrecht, Netherlands, CityVadodara, India, CityVancouver, WA, United
## States, CityVienna, Austria, CityVirginia Beach, VA, United States,
## CityVoronezh, Russia, CityWichita, KS, United States, CityZaragoza
## (Saragossa), Spain
## Warning in preProcess.default(thresh = 0.95, k = 5, freqCut = 19,
## uniqueCut = 10, : These variables have zero variances: CityAd Dammam, Saudi
## Arabia, CityAddis Ababa, Ethiopia, CityAhmedabad, India, CityAlbany, NY,
## United States, CityAlmaty, Kazakhstan, CityAnchorage, AK, United States,
## CityAnkara, Turkey, CityAntwerp, Belgium, CityAsheville, NC, United
## States, CityAthens, Greece, CityAtlanta, GA, United States, CityAuckland,
## New Zealand, CityBakersfield, CA, United States, CityBarranquilla,
## Colombia, CityBelfast, United Kingdom, CityBellevue, WA, United States,
## CityBellingham, WA, United States, CityBergen, Norway, CityBogota,
## Colombia, CityBoise, ID, United States, CityBologna, Italy, CityBonn,
## Germany, CityBraga, Portugal, CityBrasov, Romania, CityBrighton, United
## Kingdom, CityBrooklyn, NY, United States, CityBuffalo, NY, United States,
## CityCalgary, Canada, CityCali, Colombia, CityCambridge, United Kingdom,
## CityCanberra, Australia, CityCancun, Mexico, CityCardiff, United Kingdom,
## CityChattanooga, TN, United States, CityChelyabinsk, Russia, CityChengdu,
## China, CityCoimbatore, India, CityColombo, Sri Lanka, CityColumbus, OH,
## United States, CityCopenhagen, Denmark, CityDelhi, India, CityDetroit,
## MI, United States, CityDnipro, Ukraine, CityDoha, Qatar, CityDresden,
## Germany, CityDubai, United Arab Emirates, CityEdinburgh, United Kingdom,
## CityEspoo, Finland, CityExeter, United Kingdom, CityFayetteville, AR,
## United States, CityFort Wayne, IN, United States, CityFunchal, Portugal,
## CityGdansk, Poland, CityGdynia, Poland, CityGlasgow, United Kingdom,
## CityGranada, Spain, CityGraz, Austria, CityGroningen, Netherlands,
## CityGuangzhou, China, CityGuatemala City, Guatemala, CityGuwahati,
## India, CityHamilton, Bermuda, CityHamilton, Canada, CityHanoi, Vietnam,
## CityHartford, CT, United States, CityHobart, Australia, CityHuntsville,
## AL, United States, CityIndore, India, CityJersey City, NJ, United States,
## CityJohor Bahru, Malaysia, CityKarachi, Pakistan, CityKaunas, Lithuania,
## CityKazan, Russia, CityKitchener, Canada, CityKolkata, India, CityKosice,
## Slovakia, CityKota Kinabalu, Malaysia, CityKrakow (Cracow), Poland,
## CityLagos, Nigeria, CityLahore, Pakistan, CityLas Vegas, NV, United States,
## CityLeuven, Belgium, CityLimassol, Cyprus, CityLisbon, Portugal, CityLittle
## Rock, AR, United States, CityLjubljana, Slovenia, CityLondon, Canada,
## CityLouisville, KY, United States, CityLudhiana, India, CityLuxembourg,
## Luxembourg, CityLyon, France, CityMale, Maldives, CityMalmo, Sweden,
## CityManila, Philippines, CityMarseille, France, CityMedellin, Colombia,
## CityMilan, Italy, CityMilton Keynes, United Kingdom, CityMilwaukee, WI,
## United States, CityMonterrey, Mexico, CityNanaimo, BC, Canada, CityNaples,
## Italy, CityNavi Mumbai, India, CityNewcastle, Australia, CityNice, France,
## CityNicosia, Cyprus, CityNizhny Novgorod, Russia, CityNorwich, United
## Kingdom, CityNottingham, United Kingdom, CityOdense, Denmark, CityOslo,
## Norway, CityOstrava, Czech Republic, CityPadova, Italy, CityPalermo,
## Italy, CityParamaribo, Suriname, CityParis, France, CityPerth, Australia,
## CityPhiladelphia, PA, United States, CityPhuket, Thailand, CityPortland,
## ME, United States, CityPortsmouth, United Kingdom, CityPoznan, Poland,
## CityPrague, Czech Republic, CityPristina, Kosovo (Disputed Territory),
## CityPune, India, CityQueretaro, Mexico, CityQuito, Ecuador, CityReading,
## United Kingdom, CityRegina, Canada, CityRichmond, VA, United States,
## CityRijeka, Croatia, CityRiyadh, Saudi Arabia, CitySaint Petersburg,
## Russia, CitySan Diego, CA, United States, CitySanta Barbara, CA, United
## States, CityShanghai, China, CitySingapore, Singapore, CityStuttgart,
## Germany, CitySumy, Ukraine, CitySurrey, Canada, CitySwindon, United
## Kingdom, CitySzeged, Hungary, CityTaichung, Taiwan, CityTaipei, Taiwan,
## CityTallahassee, FL, United States, CityThe Hague (Den Haag), Netherlands,
## CityThessaloniki, Greece, CityTijuana, Mexico, CityToledo, OH, United
## States, CityTrieste, Italy, CityUlaanbaatar, Mongolia, CityUtrecht,
## Netherlands, CityVadodara, India, CityVancouver, WA, United States,
## CityVienna, Austria, CityVirginia Beach, VA, United States, CityVoronezh,
## Russia, CityWichita, KS, United States, CityZaragoza (Saragossa), Spain
#knn
library(MLmetrics)
## 
## Attaching package: 'MLmetrics'
## The following objects are masked from 'package:caret':
## 
##     MAE, RMSE
## The following object is masked from 'package:base':
## 
##     Recall
plot(knn)

test<-predict(knn,newdata = testing)
mean((testing$Rank-test)^2)
## [1] 565.6455

final MSE

all.MSE<-data.frame(MSE=c("793.363","379.7","39.64","1.71","374"),Model=c("knn classification","regression tree","Multiple linear regression","Random Forest","regression tree"))
ggplot(data=all.MSE,aes(x=Model,y=MSE)) +
  geom_bar(stat="identity")

PCA + K-Means

Cleaning Data for PCA:

data_clean <- data[,-c(1,2)]

PCA ANALYSIS + K-MEANS CLUSTERING:

#ALL PRINCIPAL COMPONENTS PRESENT
pComp <- prcomp(as.matrix(data_clean[,-c(2)]), scale = TRUE, center = TRUE)
biplot(pComp, main="PC BiPlot")

plot(pComp, main = "Screeplot A")

plot(pComp, type='l', main = "Screeplot B")

allcomp <- data.frame(pComp$x[,1:5])
plot(allcomp, pch=16, col=rgb(0,0,0,0.5), main="All PC's Projection")

#Kaiser recommends to keep 1 PC
#To keep 95% of the variance keep 2 PC's
#screeplot recommends to keep 2 PC's

#WITH TWO PRINCIPLAL COMPONENTS RETAINED
retainedcomp <- data.frame(pComp$x[,1:2])
plot(retainedcomp, pch=16, col=rgb(0,0,0,0.5), main="Retainded PC1 and PC2 Projection")

summary(pComp)
## Importance of components:
##                           PC1     PC2     PC3     PC4     PC5
## Standard deviation     2.0846 0.67091 0.37487 0.22285 0.11810
## Proportion of Variance 0.8691 0.09002 0.02811 0.00993 0.00279
## Cumulative Proportion  0.8691 0.95917 0.98728 0.99721 1.00000
round(pComp$rotation[,1:5],2)
##                                  PC1   PC2   PC3   PC4   PC5
## Cost.of.Living.Index           -0.47  0.22 -0.02  0.19 -0.83
## Cost.of.Living.Plus.Rent.Index -0.47  0.19  0.06 -0.85  0.12
## Groceries.Index                -0.46  0.23  0.64  0.40  0.40
## Restaurant.Price.Index         -0.46  0.10 -0.76  0.27  0.37
## Local.Purchasing.Power.Index   -0.38 -0.92  0.09  0.00 -0.03
#Determining Number of Clusters
withinSumSquares <- (nrow(data_clean)-1)*sum(apply(data_clean,2,var))
for (i in 2:535) withinSumSquares[i] <- sum(kmeans(data_clean,centers=i)$withinss)
plot(1:535, withinSumSquares, type="b", xlab="Number of Clusters", ylab="Within groups sum of squares", main="Within groups sum of squares")

#We should choose k=5 as shown from the Within groups sum of squares plot.
myKmean <- kmeans((retainedcomp), 5)
myKmean
## K-means clustering with 5 clusters of sizes 28, 123, 86, 42, 257
## 
## Cluster means:
##          PC1        PC2
## 1 -4.3675494  0.8380009
## 2  2.3919512  0.4288863
## 3  0.8999329  0.1118262
## 4  2.7691896 -0.6216821
## 5 -1.4226413 -0.2323869
## 
## Clustering vector:
##   [1] 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 5 5 5 1 1 5 5 5 5 5 1
##  [36] 5 1 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
##  [71] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [106] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [141] 5 5 5 5 3 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [176] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5
## [211] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 3 5 5 3 5 5 5 5 5 5 5 5 5 5 5 5 5
## [246] 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 3 5 5 3 5 5 5 5 3 5 3 5 3 5 5 5 3 5
## [281] 5 5 5 5 5 5 3 5 5 5 5 5 5 5 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 5
## [316] 3 3 3 3 3 3 3 3 3 3 3 3 3 3 2 3 2 3 3 3 3 3 3 3 3 3 3 2 3 2 2 3 3 3 3
## [351] 3 2 3 3 2 3 2 3 3 3 2 2 2 3 2 2 3 3 3 2 3 3 2 2 3 3 3 2 2 3 2 2 3 2 2
## [386] 3 3 2 2 3 2 2 3 2 2 3 2 2 3 2 2 3 2 2 2 4 2 2 2 2 2 2 2 2 2 2 3 2 2 2
## [421] 4 2 2 2 4 2 2 2 2 2 2 2 4 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 4 2 2 2 2 2 2
## [456] 4 2 2 2 2 2 2 2 4 2 2 2 2 2 2 2 2 2 2 2 2 2 4 2 2 2 2 4 2 2 4 2 2 2 2
## [491] 2 2 2 2 4 2 4 4 2 2 4 2 4 4 2 2 4 4 4 2 2 4 4 4 4 4 4 4 4 2 4 2 4 4 4
## [526] 4 4 4 4 4 4 4 4 4 4 4
## 
## Within cluster sum of squares by cluster:
## [1]  61.71396  38.63183  64.07988  16.67210 161.49981
##  (between_SS / total_SS =  86.6 %)
## 
## Available components:
## 
## [1] "cluster"      "centers"      "totss"        "withinss"    
## [5] "tot.withinss" "betweenss"    "size"         "iter"        
## [9] "ifault"
palette(alpha(brewer.pal(9,'Set1'), 0.5))
plot(allcomp, col=myKmean$cluster, pch=16, main="All PC's K-Means Cluster Projection")

plot(retainedcomp, col=myKmean$cluster, pch=16, main="Retained PC's K-Means Cluster Projection")

# Centers
myKmean$centers
##          PC1        PC2
## 1 -4.3675494  0.8380009
## 2  2.3919512  0.4288863
## 3  0.8999329  0.1118262
## 4  2.7691896 -0.6216821
## 5 -1.4226413 -0.2323869
# Cluster sizes
groups <- data.frame(myKmean$cluster)
table(groups)
## groups
##   1   2   3   4   5 
##  28 123  86  42 257
# Cities by cluster
data[myKmean$cluster==1,]
##    Rank                             City Cost.of.Living.Index Rent.Index
## 1     1                Hamilton, Bermuda               137.56     103.03
## 2     2              Zurich, Switzerland               128.65      62.62
## 3     3               Basel, Switzerland               126.89      46.14
## 4     4            Lausanne, Switzerland               119.62      50.35
## 5     5                Bern, Switzerland               118.42      39.22
## 6     6              Geneva, Switzerland               118.33      69.16
## 7     7               Reykjavik, Iceland               112.57      57.40
## 8     8              Lugano, Switzerland               111.88      49.58
## 9     9                Stavanger, Norway               111.00      38.85
## 10   10                     Oslo, Norway               107.14      48.58
## 11   11                   Bergen, Norway               102.87      39.38
## 12   12      New York, NY, United States               100.00     100.00
## 13   13                Trondheim, Norway                99.73      39.87
## 14   14 San Francisco, CA, United States                96.88     106.49
## 15   15      Honolulu, HI, United States                93.72      63.96
## 16   16     Anchorage, AK, United States                93.19      39.45
## 17   17      Brooklyn, NY, United States                90.31      81.02
## 18   18    Washington, DC, United States                88.50      70.28
## 19   19    Santa Rosa, CA, United States                88.27      56.69
## 20   20              Copenhagen, Denmark                87.91      47.84
## 21   21    Charleston, SC, United States                86.87      46.12
## 22   22           Luxembourg, Luxembourg                86.85      61.31
## 23   23      Bellevue, WA, United States                85.97      61.20
## 24   24       Seattle, WA, United States                85.51      64.70
## 28   28      Berkeley, CA, United States                84.09      76.39
## 29   29   Jersey City, NJ, United States                84.08      61.58
## 35   35       Oakland, CA, United States                81.18      77.14
## 37   37        Boston, MA, United States                80.46      76.09
##    Cost.of.Living.Plus.Rent.Index Groceries.Index Restaurant.Price.Index
## 1                          121.21          126.56                 151.77
## 2                           97.39          127.35                 127.14
## 3                           88.66          120.44                 129.10
## 4                           86.83          116.35                 122.83
## 5                           80.93          114.54                 114.86
## 6                           95.06          112.08                 119.78
## 7                           86.45           98.53                 127.87
## 8                           82.39          104.85                 120.62
## 9                           76.85           95.97                 134.55
## 10                          79.42           93.81                 114.42
## 11                          72.82           87.02                 116.35
## 12                         100.00          100.00                 100.00
## 13                          71.39           82.31                 120.45
## 14                         101.43          101.93                  94.58
## 15                          79.63           96.32                  86.72
## 16                          67.75           96.74                  78.76
## 17                          85.91           83.16                  95.27
## 18                          79.87           86.63                  86.23
## 19                          73.32           84.35                  82.55
## 20                          68.94           64.59                 113.18
## 21                          67.58           90.86                  73.48
## 22                          74.76           70.75                  99.49
## 23                          74.24           78.24                  82.29
## 24                          75.66           83.72                  80.27
## 28                          80.45           81.99                  87.60
## 29                          73.43           86.08                  81.44
## 35                          79.27           77.54                  78.55
## 37                          78.39           75.71                  83.08
##    Local.Purchasing.Power.Index
## 1                        114.19
## 2                        142.39
## 3                        141.48
## 4                        132.58
## 5                        115.48
## 6                        133.47
## 7                         94.21
## 8                        131.26
## 9                        112.62
## 10                       104.30
## 11                       108.19
## 12                       100.00
## 13                       113.08
## 14                       125.95
## 15                       113.58
## 16                       138.38
## 17                        87.05
## 18                       131.53
## 19                       116.47
## 20                       114.05
## 21                       106.06
## 22                       120.25
## 23                       186.00
## 24                       140.00
## 28                       119.03
## 29                       120.46
## 35                       137.74
## 37                       124.57
data[myKmean$cluster==2,]
##     Rank                               City Cost.of.Living.Index
## 330  330              Addis Ababa, Ethiopia                49.96
## 332  332                       Havana, Cuba                49.52
## 343  343                   Harare, Zimbabwe                47.78
## 345  345          San Salvador, El Salvador                47.22
## 346  346                 Guayaquil, Ecuador                47.21
## 352  352  Santo Domingo, Dominican Republic                45.88
## 355  355               Phnom Penh, Cambodia                45.67
## 357  357                    Osijek, Croatia                44.95
## 361  361                   Campinas, Brazil                44.45
## 362  362          Guatemala City, Guatemala                44.39
## 363  363            Dar es Salaam, Tanzania                44.33
## 365  365                  Sao Paulo, Brazil                44.16
## 366  366             Rio de Janeiro, Brazil                44.12
## 370  370                  Budapest, Hungary                43.74
## 373  373                  Pattaya, Thailand                42.53
## 374  374                        Irbil, Iraq                42.51
## 378  378                  Kuching, Malaysia                42.15
## 379  379            Kota Kinabalu, Malaysia                42.15
## 381  381                     Nairobi, Kenya                41.76
## 382  382                 Jakarta, Indonesia                41.60
## 384  384                    Bali, Indonesia                41.48
## 385  385                         Lima, Peru                41.47
## 388  388                     Recife, Brazil                40.67
## 389  389               Porto Alegre, Brazil                40.56
## 391  391               Chiang Mai, Thailand                40.53
## 392  392             Belo Horizonte, Brazil                40.48
## 394  394                 Bucharest, Romania                40.39
## 395  395                    Sofia, Bulgaria                40.36
## 397  397              Florianopolis, Brazil                40.26
## 398  398                   Belgrade, Serbia                40.10
## 400  400              Podgorica, Montenegro                39.83
## 401  401            Krakow (Cracow), Poland                39.53
## 403  403           Saint Petersburg, Russia                39.25
## 404  404   Sarajevo, Bosnia And Herzegovina                39.25
## 405  405                    Varna, Bulgaria                39.13
## 407  407                 Constanta, Romania                38.89
## 408  408                     Rabat, Morocco                38.59
## 409  409            Buenos Aires, Argentina                38.57
## 410  410                  Bydgoszcz, Poland                38.54
## 411  411                    Szeged, Hungary                38.41
## 412  412                     Hanoi, Vietnam                38.34
## 413  413                   Curitiba, Brazil                38.34
## 414  414                 Timisoara, Romania                38.19
## 415  415               Cluj-Napoca, Romania                38.13
## 416  416                  Debrecen, Hungary                38.05
## 418  418                Manila, Philippines                37.95
## 419  419                   Istanbul, Turkey                37.85
## 420  420          Ho Chi Minh City, Vietnam                37.82
## 422  422                   Szczecin, Poland                37.35
## 423  423                Chelyabinsk, Russia                37.29
## 424  424                    Tirana, Albania                37.25
## 426  426                    Brasov, Romania                37.13
## 427  427 Banja Luka, Bosnia And Herzegovina                36.54
## 428  428                      Iasi, Romania                36.54
## 429  429                  Plovdiv, Bulgaria                36.45
## 430  430                  Cebu, Philippines                36.41
## 431  431              Yekaterinburg, Russia                36.41
## 432  432                   Burgas, Bulgaria                36.26
## 434  434                    Cuenca, Ecuador                36.13
## 435  435                     Lublin, Poland                36.12
## 436  436                 Colombo, Sri Lanka                36.00
## 437  437                     Samara, Russia                35.96
## 438  438                      Arad, Romania                35.84
## 439  439                Surabaya, Indonesia                35.72
## 440  440                Casablanca, Morocco                35.68
## 441  441                     Sibiu, Romania                35.63
## 442  442                 Bandung, Indonesia                35.58
## 443  443               Paramaribo, Suriname                35.45
## 444  444                Kaliningrad, Russia                35.40
## 445  445                   Novi Sad, Serbia                35.36
## 446  446                   Bogota, Colombia                35.05
## 447  447              Yogyakarta, Indonesia                34.91
## 448  448                 Astana, Kazakhstan                34.90
## 450  450                  Skopje, Macedonia                34.68
## 451  451                    Oradea, Romania                34.35
## 452  452                        Nis, Serbia                34.20
## 453  453                       Tehran, Iran                34.19
## 454  454                Mexico City, Mexico                34.18
## 455  455              Ulaanbaatar, Mongolia                34.16
## 457  457                     Minsk, Belarus                34.07
## 458  458            Nizhny Novgorod, Russia                34.04
## 459  459             Barranquilla, Colombia                34.04
## 460  460                      Izmir, Turkey                34.03
## 461  461                 Medellin, Colombia                33.82
## 462  462                    Antalya, Turkey                33.78
## 463  463                  Chisinau, Moldova                33.75
## 465  465                      Kazan, Russia                33.67
## 466  466                Novosibirsk, Russia                33.65
## 467  467                 Davao, Philippines                33.57
## 468  468                 Asuncion, Paraguay                33.49
## 469  469                   Algiers, Algeria                33.44
## 470  470                     Lagos, Nigeria                33.33
## 471  471             Dumaguete, Philippines                33.21
## 472  472                   Yerevan, Armenia                33.16
## 473  473                    Tijuana, Mexico                32.70
## 474  474                 Almaty, Kazakhstan                32.51
## 475  475             Rostov-na-donu, Russia                32.40
## 476  476                  Krasnodar, Russia                32.37
## 477  477                   Kathmandu, Nepal                31.89
## 479  479                   Voronezh, Russia                31.74
## 480  480           Quezon City, Philippines                31.66
## 481  481                  Dhaka, Bangladesh                31.57
## 482  482                    Kampala, Uganda                31.51
## 484  484                     Cancun, Mexico                31.35
## 485  485                  Queretaro, Mexico                31.01
## 487  487                     Cali, Colombia                30.48
## 488  488                   Tbilisi, Georgia                30.22
## 489  489                    Odessa, Ukraine                30.13
## 490  490               Tashkent, Uzbekistan                29.94
## 491  491            Puerto Vallarta, Mexico                29.82
## 492  492                      Kiev, Ukraine                29.42
## 493  493                   Baku, Azerbaijan                29.41
## 494  494                     Merida, Mexico                29.39
## 496  496                     Puebla, Mexico                28.89
## 499  499                    Dnipro, Ukraine                27.96
## 500  500                 Caracas, Venezuela                27.82
## 502  502                      Lviv, Ukraine                27.24
## 505  505                   Kharkiv, Ukraine                26.71
## 506  506                     Tunis, Tunisia                26.53
## 510  510                   Lahore, Pakistan                25.83
## 511  511                       Cairo, Egypt                25.68
## 520  520                  Alexandria, Egypt                23.92
## 522  522                      Sumy, Ukraine                23.84
##     Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 330      28.77                          39.93           39.26
## 332       9.56                          30.60           35.26
## 343      13.31                          31.46           40.14
## 345      15.92                          32.40           45.60
## 346      14.87                          31.90           39.27
## 352      11.73                          29.72           35.34
## 355      17.63                          32.40           45.08
## 357       7.51                          27.23           35.73
## 361      12.25                          29.21           30.99
## 362      14.77                          30.37           39.08
## 363      22.22                          33.87           30.77
## 365      16.59                          31.11           32.25
## 366      16.19                          30.89           29.67
## 370      16.04                          30.63           33.14
## 373      19.18                          31.48           43.07
## 374      11.69                          27.92           36.73
## 378       5.74                          24.92           42.98
## 379      12.08                          27.92           42.93
## 381      13.17                          28.23           36.97
## 382      15.80                          29.39           41.08
## 384       8.45                          25.84           44.51
## 385      15.51                          29.18           36.03
## 388       8.17                          25.29           30.60
## 389      10.49                          26.32           28.08
## 391      11.04                          26.57           46.11
## 392       9.86                          25.99           26.77
## 394      12.86                          27.36           30.96
## 395      12.36                          27.10           33.08
## 397      12.08                          26.92           28.90
## 398      11.54                          26.58           28.17
## 400       9.68                          25.56           29.54
## 401      17.33                          29.02           29.92
## 403      17.55                          28.98           30.71
## 404       9.22                          25.03           29.94
## 405       8.49                          24.63           32.69
## 407       8.44                          24.48           27.69
## 408      13.42                          26.67           32.89
## 409      11.75                          25.87           29.66
## 410      14.65                          27.23           29.79
## 411       9.60                          24.77           30.26
## 412      13.06                          26.37           35.91
## 413       9.68                          24.77           25.26
## 414      10.74                          25.20           30.87
## 415      13.27                          26.36           31.34
## 416       9.29                          24.44           29.62
## 418      15.80                          27.46           31.73
## 419      11.20                          25.24           31.34
## 420      16.41                          27.69           36.25
## 422      12.27                          25.48           26.88
## 423       7.64                          23.25           32.57
## 424      10.18                          24.43           28.33
## 426      10.76                          24.65           28.62
## 427       7.47                          22.78           28.38
## 428       9.89                          23.92           29.24
## 429       7.86                          22.92           29.56
## 430      10.52                          24.16           34.29
## 431      11.45                          24.60           29.43
## 432       7.32                          22.56           29.78
## 434      10.63                          24.06           31.13
## 435      17.45                          27.28           27.87
## 436      10.87                          24.11           37.80
## 437      11.23                          24.26           28.06
## 438       8.62                          22.96           28.54
## 439       7.03                          22.14           38.13
## 440      15.30                          26.03           28.81
## 441       8.99                          23.02           28.98
## 442       7.38                          22.23           37.78
## 443       6.88                          21.93           37.34
## 444       7.58                          22.23           28.28
## 445       7.06                          21.97           26.62
## 446      12.63                          24.44           26.09
## 447       7.32                          21.85           38.34
## 448      12.00                          24.06           27.81
## 450       9.00                          22.52           26.04
## 451       7.01                          21.41           27.89
## 452       5.61                          20.66           25.56
## 453      18.48                          26.75           28.27
## 454      17.94                          26.49           29.88
## 455       9.46                          22.47           31.33
## 457      10.95                          23.13           26.58
## 458      10.46                          22.88           27.39
## 459       9.54                          22.44           25.05
## 460       7.94                          21.68           28.41
## 461      11.16                          23.09           27.87
## 462       6.01                          20.64           31.25
## 463       8.66                          21.87           25.05
## 465      11.02                          22.95           26.46
## 466      10.85                          22.86           28.36
## 467       7.28                          21.13           30.27
## 468      10.53                          22.62           26.16
## 469       8.93                          21.84           33.22
## 470      30.24                          31.86           27.68
## 471       7.35                          20.97           35.44
## 472       9.67                          22.04           25.40
## 473      10.75                          22.31           27.50
## 474      11.68                          22.65           24.50
## 475      10.43                          22.00           24.78
## 476      10.48                          22.01           25.66
## 477       5.15                          19.23           27.07
## 479       7.40                          20.22           26.77
## 480       8.34                          20.62           26.12
## 481       6.03                          19.48           28.10
## 482       9.36                          21.02           25.60
## 484      10.30                          21.39           26.75
## 485       9.26                          20.72           28.38
## 487       7.55                          19.62           24.69
## 488      10.46                          20.87           23.36
## 489      10.22                          20.70           21.03
## 490       9.43                          20.23           24.99
## 491      14.71                          22.67           26.85
## 492      14.53                          22.37           23.17
## 493       9.30                          19.89           24.32
## 494       5.72                          18.19           26.53
## 496       6.88                          18.47           24.07
## 499       7.41                          18.23           20.28
## 500       8.43                          18.64           28.40
## 502       9.92                          19.04           21.17
## 505       8.80                          18.23           19.40
## 506       6.83                          17.21           24.26
## 510       5.27                          16.10           22.76
## 511       5.24                          16.01           21.31
## 520       3.67                          14.33           21.09
## 522       3.75                          14.33           18.01
##     Restaurant.Price.Index Local.Purchasing.Power.Index
## 330                  25.06                        11.84
## 332                  28.80                         2.24
## 343                  34.75                        27.70
## 345                  35.92                        32.08
## 346                  36.69                        35.23
## 352                  43.65                        32.05
## 355                  25.71                        22.53
## 357                  33.88                        60.74
## 361                  42.79                        52.58
## 362                  34.49                        39.76
## 363                  32.43                        29.36
## 365                  38.79                        41.16
## 366                  40.01                        36.57
## 370                  35.79                        57.49
## 373                  27.58                        28.42
## 374                  30.83                        51.76
## 378                  18.94                        40.85
## 379                  22.28                        41.36
## 381                  35.98                        30.62
## 382                  24.79                        28.95
## 384                  24.08                        27.20
## 385                  31.08                        39.34
## 388                  32.84                        27.96
## 389                  32.38                        48.63
## 391                  20.17                        33.13
## 392                  33.38                        35.94
## 394                  39.75                        58.57
## 395                  32.60                        61.94
## 397                  36.15                        40.22
## 398                  35.39                        41.02
## 400                  34.44                        52.16
## 401                  33.78                        70.68
## 403                  40.88                        57.01
## 404                  29.14                        49.70
## 405                  34.34                        52.57
## 407                  38.34                        53.50
## 408                  26.71                        46.21
## 409                  37.47                        59.76
## 410                  30.29                        66.32
## 411                  28.58                        47.26
## 412                  21.05                        44.08
## 413                  32.27                        38.94
## 414                  35.35                        55.46
## 415                  33.54                        56.94
## 416                  30.17                        56.37
## 418                  24.11                        40.04
## 419                  27.85                        50.13
## 420                  19.56                        30.36
## 422                  30.21                        61.98
## 423                  35.96                        45.00
## 424                  31.35                        35.89
## 426                  32.52                        60.25
## 427                  23.94                        50.19
## 428                  32.88                        53.70
## 429                  30.19                        60.20
## 430                  21.53                        24.37
## 431                  32.23                        53.01
## 432                  30.88                        53.02
## 434                  25.89                        44.63
## 435                  28.86                        59.11
## 436                  21.20                        27.54
## 437                  40.12                        42.96
## 438                  28.06                        61.04
## 439                  16.96                        37.81
## 440                  28.35                        40.76
## 441                  29.59                        56.52
## 442                  15.10                        28.81
## 443                  28.82                        25.91
## 444                  36.72                        41.50
## 445                  27.80                        50.21
## 446                  27.92                        37.44
## 447                  13.44                        30.83
## 448                  37.00                        41.22
## 450                  28.69                        41.45
## 451                  26.30                        51.30
## 452                  29.16                        40.99
## 453                  29.54                        40.89
## 454                  30.51                        51.40
## 455                  24.29                        33.64
## 457                  38.05                        46.29
## 458                  34.16                        40.78
## 459                  24.07                        42.73
## 460                  23.59                        56.87
## 461                  24.50                        34.02
## 462                  27.42                        61.79
## 463                  30.43                        32.92
## 465                  39.27                        51.62
## 466                  31.16                        49.09
## 467                  20.52                        26.40
## 468                  26.26                        37.30
## 469                  21.35                        36.42
## 470                  27.83                        19.41
## 471                  16.61                        15.06
## 472                  33.31                        33.43
## 473                  30.98                        57.98
## 474                  31.66                        43.40
## 475                  33.68                        41.38
## 476                  31.59                        49.19
## 477                  20.72                        26.48
## 479                  29.60                        50.01
## 480                  17.97                        27.91
## 481                  20.73                        41.15
## 482                  25.09                        24.38
## 484                  31.52                        53.68
## 485                  27.45                        57.83
## 487                  23.02                        39.31
## 488                  29.22                        39.57
## 489                  25.50                        31.26
## 490                  21.66                        25.17
## 491                  29.38                        54.23
## 492                  23.51                        39.37
## 493                  31.25                        34.29
## 494                  24.44                        40.29
## 496                  24.36                        44.80
## 499                  24.78                        36.44
## 500                  23.63                         4.18
## 502                  20.42                        30.39
## 505                  21.91                        31.62
## 506                  15.87                        35.51
## 510                  23.12                        39.75
## 511                  23.26                        26.31
## 520                  19.02                        23.06
## 522                  15.53                        28.43
data[myKmean$cluster==3,]
##     Rank                               City Cost.of.Living.Index
## 145  145                     Male, Maldives                70.45
## 229  229                      Naples, Italy                64.82
## 232  232                  Kingston, Jamaica                64.59
## 263  263                   Taichung, Taiwan                62.23
## 266  266                   Barcelona, Spain                62.15
## 271  271                     Palermo, Italy                61.16
## 273  273                    Nicosia, Cyprus                60.97
## 275  275                    Beirut, Lebanon                60.79
## 279  279                     Athens, Greece                60.44
## 287  287 Port of Spain, Trinidad And Tobago                59.60
## 295  295                Montevideo, Uruguay                58.05
## 296  296        Zaragoza (Saragossa), Spain                58.00
## 297  297               Thessaloniki, Greece                57.97
## 298  298               San Jose, Costa Rica                57.84
## 299  299                   Limassol, Cyprus                57.71
## 300  300                       Accra, Ghana                57.23
## 301  301                  Kaohsiung, Taiwan                56.44
## 302  302                Ljubljana, Slovenia                56.34
## 303  303                    Valencia, Spain                55.27
## 304  304                    Manama, Bahrain                55.23
## 305  305                   Tallinn, Estonia                55.23
## 306  306                Panama City, Panama                54.91
## 307  307                      Amman, Jordan                54.72
## 308  308           Seville (Sevilla), Spain                54.70
## 309  309                    Larnaca, Cyprus                54.31
## 310  310                   Lisbon, Portugal                54.16
## 311  311                    Alicante, Spain                53.90
## 312  312                     Split, Croatia                53.62
## 313  313                  Bangkok, Thailand                53.61
## 314  314      Sharjah, United Arab Emirates                53.45
## 316  316                    Rijeka, Croatia                52.96
## 317  317                    Zagreb, Croatia                52.20
## 318  318                Makati, Philippines                51.07
## 319  319                  Coimbra, Portugal                51.07
## 320  320                       Muscat, Oman                51.04
## 321  321            Al Khobar, Saudi Arabia                51.03
## 322  322                  Funchal, Portugal                50.90
## 323  323                       Riga, Latvia                50.82
## 324  324                    Porto, Portugal                50.43
## 325  325                    Shanghai, China                50.41
## 326  326                     Granada, Spain                50.41
## 327  327                      Malaga, Spain                50.38
## 328  328                    Santiago, Chile                50.37
## 329  329      Jeddah (Jiddah), Saudi Arabia                49.99
## 331  331                     Tartu, Estonia                49.65
## 333  333                     Quito, Ecuador                49.42
## 334  334                  Maribor, Slovenia                49.30
## 335  335      Santa Cruz de Tenerife, Spain                48.69
## 336  336               Riyadh, Saudi Arabia                48.68
## 337  337               Bratislava, Slovakia                48.64
## 338  338                    Braga, Portugal                48.55
## 339  339            Ad Dammam, Saudi Arabia                48.43
## 340  340                 Vilnius, Lithuania                48.31
## 341  341             Prague, Czech Republic                48.02
## 342  342        Bandar Seri Begawan, Brunei                48.01
## 344  344  Las Palmas de Gran Canaria, Spain                47.39
## 347  347                      Baghdad, Iraq                47.17
## 348  348                   Phuket, Thailand                46.98
## 349  349                Klaipeda, Lithuania                46.98
## 350  350                   Kosice, Slovakia                46.27
## 351  351             Pretoria, South Africa                45.89
## 353  353                  Kaunas, Lithuania                45.88
## 354  354                  Windhoek, Namibia                45.84
## 356  356         Johannesburg, South Africa                45.51
## 358  358               Brno, Czech Republic                44.59
## 359  359                     Moscow, Russia                44.54
## 360  360                 Selangor, Malaysia                44.53
## 364  364            Petaling Jaya, Malaysia                44.31
## 367  367                   Brasilia, Brazil                44.02
## 368  368                   Penang, Malaysia                43.98
## 369  369                     Beijing, China                43.88
## 371  371                     Gdansk, Poland                42.82
## 372  372              Johor Bahru, Malaysia                42.59
## 375  375             Kuala Lumpur, Malaysia                42.44
## 376  376                     Warsaw, Poland                42.32
## 377  377                    Shenzhen, China                42.21
## 380  380       Peterborough, United Kingdom                41.93
## 383  383            Cape Town, South Africa                41.58
## 386  386            Olomouc, Czech Republic                41.27
## 387  387                     Gdynia, Poland                41.22
## 390  390            Ostrava, Czech Republic                40.55
## 393  393               Durban, South Africa                40.48
## 396  396                   Guangzhou, China                40.29
## 399  399                    Wroclaw, Poland                40.00
## 402  402       Port Elizabeth, South Africa                39.41
## 417  417                      Suzhou, China                37.95
##     Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 145      31.96                          52.23           71.79
## 229      18.34                          42.82           56.22
## 232      15.89                          41.54           64.91
## 263      13.02                          38.94           72.88
## 266      32.44                          48.09           48.06
## 271      16.75                          40.14           50.93
## 273      17.72                          40.50           46.70
## 275      32.31                          47.31           42.01
## 279      12.73                          37.85           44.92
## 287      19.73                          40.73           55.83
## 295      17.98                          39.09           44.97
## 296      18.18                          39.15           45.42
## 297      11.28                          35.86           43.49
## 298      18.15                          39.05           54.00
## 299      25.14                          42.29           44.64
## 300      36.27                          47.31           50.61
## 301       9.66                          34.30           63.90
## 302      19.10                          38.71           44.61
## 303      19.30                          38.24           43.85
## 304      28.59                          42.62           47.89
## 305      17.81                          37.51           37.57
## 306      30.02                          43.13           48.72
## 307      12.29                          34.63           43.18
## 308      20.25                          38.39           43.86
## 309      11.52                          34.06           41.24
## 310      29.92                          42.69           42.20
## 311      15.68                          35.81           42.74
## 312      13.41                          34.59           42.31
## 313      25.72                          40.41           52.65
## 314      27.86                          41.34           42.29
## 316      11.34                          33.26           41.96
## 317      14.69                          34.44           41.94
## 318      23.04                          37.80           53.50
## 319      13.59                          33.33           40.31
## 320      24.72                          38.58           41.46
## 321      14.18                          33.58           43.30
## 322      17.76                          35.21           38.92
## 323      13.56                          33.18           36.36
## 324      21.87                          36.91           39.50
## 325      34.08                          42.68           51.66
## 326      14.72                          33.52           37.44
## 327      20.51                          36.24           40.51
## 328      17.21                          34.68           40.37
## 329      12.25                          32.12           37.48
## 331      13.67                          32.62           37.77
## 333      14.79                          33.03           45.13
## 334      10.80                          31.08           38.45
## 335      17.39                          33.87           37.32
## 336      14.06                          32.30           38.42
## 337      22.28                          36.16           39.84
## 338      12.92                          31.69           38.22
## 339      12.46                          31.40           40.41
## 340      17.05                          33.51           35.05
## 341      23.87                          36.59           39.22
## 342      24.00                          36.64           46.01
## 344      19.71                          34.29           39.00
## 347      14.09                          31.51           37.22
## 348      15.25                          31.96           47.75
## 349      10.79                          29.85           36.30
## 350      15.30                          31.61           36.56
## 351      13.92                          30.75           34.99
## 353      11.73                          29.71           34.52
## 354      20.34                          33.77           40.21
## 356      17.34                          32.18           35.68
## 358      18.20                          32.10           36.98
## 359      29.31                          37.33           33.29
## 360       8.87                          27.65           40.31
## 364      12.11                          29.07           48.95
## 367      13.90                          29.76           34.36
## 368      10.13                          27.96           45.30
## 369      31.50                          38.02           37.61
## 371      16.42                          30.32           30.83
## 372       9.83                          27.09           50.21
## 375      16.70                          30.25           41.63
## 376      20.60                          32.04           31.63
## 377      25.64                          34.37           39.71
## 380      19.52                          31.32           22.53
## 383      27.38                          34.86           32.79
## 386      12.42                          27.61           36.53
## 387      13.91                          28.29           30.93
## 390       9.60                          25.90           33.62
## 393      13.43                          27.67           31.46
## 396      18.96                          30.19           37.63
## 399      17.35                          29.27           31.51
## 402      11.43                          26.17           31.14
## 417      15.78                          27.45           36.03
##     Restaurant.Price.Index Local.Purchasing.Power.Index
## 145                  39.36                        28.32
## 229                  59.15                        68.80
## 232                  41.79                        29.03
## 263                  28.17                        65.41
## 266                  60.42                        80.46
## 271                  59.39                        80.13
## 273                  70.81                        74.05
## 275                  64.39                        54.43
## 279                  62.38                        52.48
## 287                  53.74                        51.20
## 295                  56.33                        50.08
## 296                  55.82                        83.22
## 297                  58.35                        49.84
## 298                  50.33                        53.97
## 299                  61.39                        77.56
## 300                  35.26                        14.15
## 301                  25.32                       110.16
## 302                  50.53                        78.01
## 303                  52.36                        90.32
## 304                  54.77                        72.63
## 305                  60.44                        74.16
## 306                  56.33                        43.49
## 307                  53.30                        45.41
## 308                  53.13                        83.49
## 309                  61.99                        80.84
## 310                  48.79                        55.01
## 311                  53.97                        80.73
## 312                  50.28                        51.11
## 313                  29.92                        44.50
## 314                  40.54                       102.11
## 316                  42.72                        54.56
## 317                  43.99                        66.88
## 318                  26.37                        44.96
## 319                  39.91                        72.57
## 320                  53.53                        94.38
## 321                  35.34                       118.44
## 322                  37.82                        54.47
## 323                  47.56                        56.56
## 324                  42.58                        59.38
## 325                  38.61                        72.16
## 326                  51.53                        92.40
## 327                  53.00                        87.90
## 328                  50.49                        51.83
## 329                  34.96                       117.30
## 331                  44.56                        83.33
## 333                  37.30                        40.02
## 334                  41.88                        90.05
## 335                  53.01                        90.92
## 336                  34.25                       125.38
## 337                  42.14                        71.93
## 338                  34.80                        64.30
## 339                  32.03                       133.28
## 340                  48.83                        61.08
## 341                  37.83                        77.71
## 342                  33.42                       105.16
## 344                  47.20                        91.00
## 347                  40.60                        44.10
## 348                  28.58                        58.71
## 349                  43.53                        58.45
## 350                  34.18                        61.88
## 351                  42.21                        83.65
## 353                  41.31                        61.43
## 354                  43.45                        55.74
## 356                  42.93                       108.84
## 358                  32.93                        75.09
## 359                  48.98                        59.51
## 360                  25.83                        91.05
## 364                  22.16                        73.49
## 367                  42.56                        63.24
## 368                  24.70                        76.04
## 369                  35.68                        79.45
## 371                  38.37                        76.20
## 372                  23.81                        59.51
## 375                  25.04                        82.84
## 376                  39.89                        76.34
## 377                  29.22                        86.03
## 380                  42.75                       139.17
## 383                  43.81                        73.59
## 386                  30.38                        79.20
## 387                  38.21                        70.10
## 390                  30.99                        84.10
## 393                  40.72                        98.98
## 396                  27.12                        82.93
## 399                  34.82                        76.70
## 402                  36.24                        76.26
## 417                  30.16                        94.00
data[myKmean$cluster==4,]
##     Rank                                  City Cost.of.Living.Index
## 406  406                        Poznan, Poland                38.99
## 421  421                      Katowice, Poland                37.48
## 425  425                          Lodz, Poland                37.13
## 433  433                        Chengdu, China                36.16
## 449  449                        Ankara, Turkey                34.77
## 456  456                     Monterrey, Mexico                34.12
## 464  464                         Bursa, Turkey                33.72
## 478  478                      Craiova, Romania                31.78
## 483  483                   Guadalajara, Mexico                31.46
## 486  486                        Gurgaon, India                30.71
## 495  495                         Mumbai, India                29.03
## 497  497                          Delhi, India                28.67
## 498  498                          Noida, India                28.55
## 501  501                           Pune, India                27.41
## 503  503                       Ludhiana, India                27.17
## 504  504                      Bangalore, India                26.83
## 507  507 Pristina, Kosovo (Disputed Territory)                26.24
## 508  508                     Chandigarh, India                26.00
## 509  509                   Islamabad, Pakistan                25.86
## 512  512                         Jaipur, India                25.46
## 513  513                         Indore, India                25.40
## 514  514                          Thane, India                25.31
## 515  515                        Chennai, India                25.20
## 516  516                        Kolkata, India                24.80
## 517  517              Lucknow (Lakhnau), India                24.75
## 518  518                            Goa, India                24.34
## 519  519                      Ahmedabad, India                24.24
## 521  521                     Karachi, Pakistan                23.90
## 523  523                          Surat, India                23.77
## 524  524                      Hyderabad, India                23.59
## 525  525                         Nagpur, India                22.76
## 526  526                       Guwahati, India                22.68
## 527  527                         Mysore, India                22.41
## 528  528                    Bhubaneswar, India                22.40
## 529  529                      Mangalore, India                22.40
## 530  530                     Coimbatore, India                22.38
## 531  531                         Bhopal, India                22.37
## 532  532                       Vadodara, India                22.28
## 533  533                          Kochi, India                21.73
## 534  534                  Visakhapatnam, India                21.52
## 535  535                    Navi Mumbai, India                19.30
## 536  536             Thiruvananthapuram, India                19.26
##     Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 406      13.25                          26.81           30.18
## 421      11.36                          25.11           27.90
## 425      11.67                          25.08           27.34
## 433      11.63                          24.55           33.43
## 449       6.56                          21.42           29.59
## 456      11.28                          23.31           29.17
## 464       5.74                          20.48           26.98
## 478       7.23                          20.16           25.59
## 483       9.49                          21.06           28.92
## 486       9.96                          20.89           26.63
## 495      20.31                          24.90           26.63
## 497       8.73                          19.23           25.80
## 498       6.18                          17.96           25.14
## 501       7.38                          17.93           26.76
## 503       4.40                          16.39           25.51
## 504       8.60                          18.20           26.53
## 507       8.36                          17.78           22.23
## 508       5.70                          16.39           25.46
## 509       7.48                          17.16           23.37
## 512       4.98                          15.76           23.87
## 513       4.40                          15.46           25.73
## 514       9.89                          18.01           24.18
## 515       6.90                          16.53           25.91
## 516       6.00                          15.90           23.35
## 517       4.44                          15.14           23.21
## 518       6.21                          15.76           24.63
## 519       5.19                          15.22           24.89
## 521       6.15                          15.50           20.89
## 523       3.78                          14.31           23.78
## 524       5.99                          15.26           23.02
## 525       4.50                          14.12           21.62
## 526       4.04                          13.85           22.91
## 527       4.32                          13.85           23.87
## 528       4.40                          13.88           23.66
## 529       5.05                          14.19           22.21
## 530       5.21                          14.25           22.45
## 531       3.43                          13.41           20.13
## 532       3.78                          13.52           22.26
## 533       5.45                          14.02           21.93
## 534       4.26                          13.35           21.09
## 535       4.70                          12.39           19.21
## 536       4.69                          12.36           18.14
##     Restaurant.Price.Index Local.Purchasing.Power.Index
## 406                  33.34                        77.35
## 421                  32.27                        77.78
## 425                  31.56                        71.81
## 433                  28.20                        82.62
## 449                  25.13                        64.55
## 456                  33.07                        79.87
## 464                  21.44                        57.91
## 478                  24.92                        59.11
## 483                  28.03                        64.69
## 486                  27.52                       113.89
## 495                  26.36                        67.69
## 497                  25.30                        77.75
## 498                  24.53                        89.48
## 501                  22.68                        86.55
## 503                  21.18                        68.43
## 504                  18.70                        96.51
## 507                  21.10                        68.94
## 508                  19.17                        64.37
## 509                  19.20                        50.11
## 512                  18.29                        77.10
## 513                  15.97                        50.73
## 514                  20.97                        81.00
## 515                  15.97                        67.87
## 516                  21.09                        60.41
## 517                  19.82                        76.50
## 518                  20.14                        54.97
## 519                  17.40                        70.18
## 521                  18.57                        36.66
## 523                  17.75                        66.45
## 524                  17.35                        78.00
## 525                  16.99                        98.45
## 526                  13.70                        71.26
## 527                  13.38                        45.78
## 528                  13.42                        67.00
## 529                  15.92                        79.58
## 530                  14.39                        56.46
## 531                  15.56                        68.22
## 532                  14.43                        74.59
## 533                  12.20                        73.42
## 534                  17.09                        55.47
## 535                  12.55                       138.06
## 536                  11.93                        68.15
data[myKmean$cluster==5,]
##     Rank                                City Cost.of.Living.Index
## 25    25                        Tokyo, Japan                84.78
## 26    26                       Paris, France                84.68
## 27    27                     Odense, Denmark                84.09
## 30    30                    Aalborg, Denmark                82.21
## 31    31              Amsterdam, Netherlands                82.14
## 32    32                  Seoul, South Korea                81.96
## 33    33                      Arhus, Denmark                81.94
## 34    34              London, United Kingdom                81.31
## 36    36                   Helsinki, Finland                80.60
## 38    38                Singapore, Singapore                80.40
## 39    39                     Dublin, Ireland                80.28
## 40    40                   Sydney, Australia                79.93
## 41    41         Hartford, CT, United States                79.85
## 42    42           Albany, NY, United States                79.38
## 43    43     Philadelphia, PA, United States                79.25
## 44    44                    Tampere, Finland                79.04
## 45    45       Milton Keynes, United Kingdom                78.50
## 46    46                    Grenoble, France                78.43
## 47    47           Irvine, CA, United States                78.38
## 48    48                        Lyon, France                78.00
## 49    49       Long Beach, CA, United States                77.95
## 50    50                       Linz, Austria                77.80
## 51    51      Los Angeles, CA, United States                77.66
## 52    52               Tel Aviv-Yafo, Israel                77.39
## 53    53                      Barrie, Canada                77.37
## 54    54          Chicago, IL, United States                77.33
## 55    55                   Stockholm, Sweden                77.23
## 56    56                     Florence, Italy                77.21
## 57    57          Boulder, CO, United States                77.16
## 58    58   The Hague (Den Haag), Netherlands                76.75
## 59    59             Reading, United Kingdom                76.73
## 60    60               Auckland, New Zealand                76.63
## 61    61                   Jerusalem, Israel                76.62
## 62    62                    Bordeaux, France                76.31
## 63    63                Utrecht, Netherlands                76.30
## 64    64                    Toulouse, France                76.30
## 65    65         San Jose, CA, United States                76.28
## 66    66       Burlington, VT, United States                76.11
## 67    67       Pittsburgh, PA, United States                76.04
## 68    68                        Nice, France                75.84
## 69    69            Miami, FL, United States                75.83
## 70    70                   Brussels, Belgium                75.69
## 71    71                       Graz, Austria                75.61
## 72    72    Santa Barbara, CA, United States                75.55
## 73    73       Sacramento, CA, United States                75.54
## 74    74                  Strasbourg, France                75.47
## 75    75                        Genoa, Italy                75.38
## 76    76                       Gent, Belgium                75.27
## 77    77                    Perth, Australia                75.09
## 78    78                    Antwerp, Belgium                74.88
## 79    79         Portland, ME, United States                74.81
## 80    80  West Palm Beach, FL, United States                74.79
## 81    81                Hong Kong, Hong Kong                74.73
## 82    82                  Innsbruck, Austria                74.66
## 83    83                     Leuven, Belgium                74.58
## 84    84                 Leiden, Netherlands                74.56
## 85    85                        Osaka, Japan                74.53
## 86    86                Melbourne, Australia                74.53
## 87    87                Bath, United Kingdom                74.48
## 88    88          Everett, WA, United States                74.36
## 89    89                   Saskatoon, Canada                74.26
## 90    90           Tacoma, WA, United States                74.21
## 91    91         Portland, OR, United States                74.17
## 92    92              Rotterdam, Netherlands                74.08
## 93    93                 Montpellier, France                74.08
## 94    94              St. John's, NL, Canada                74.05
## 95    95                        Milan, Italy                73.89
## 96    96             Maastricht, Netherlands                73.87
## 97    97        Baltimore, MD, United States                73.85
## 98    98                     Munich, Germany                73.79
## 99    99                      Espoo, Finland                73.78
## 100  100      New Orleans, LA, United States                73.61
## 101  101                     Galway, Ireland                73.54
## 102  102                       Cork, Ireland                73.53
## 103  103                       Padova, Italy                73.49
## 104  104                       Haifa, Israel                73.42
## 105  105        Charlotte, NC, United States                73.33
## 106  106                  Burlington, Canada                73.13
## 107  107            Aberdeen, United Kingdom                73.02
## 108  108                 Dusseldorf, Germany                73.00
## 109  109      Minneapolis, MN, United States                72.93
## 110  110                 Adelaide, Australia                72.92
## 111  111              Eindhoven, Netherlands                72.82
## 112  112           Cambridge, United Kingdom                72.60
## 113  113              Oxford, United Kingdom                72.60
## 114  114                   Darwin, Australia                72.47
## 115  115           Eugene, OR, United States                72.46
## 116  116                      Nantes, France                72.37
## 117  117              Groningen, Netherlands                72.29
## 118  118        San Diego, CA, United States                72.29
## 119  119                   Ramat Gan, Israel                72.15
## 120  120                    Hamburg, Germany                72.15
## 121  121       Bellingham, WA, United States                72.14
## 122  122          Atlanta, GA, United States                72.05
## 123  123           Denver, CO, United States                72.02
## 124  124       Saint Paul, MN, United States                71.94
## 125  125               Hamilton, New Zealand                71.91
## 126  126       Birmingham, AL, United States                71.87
## 127  127                  Frankfurt, Germany                71.64
## 128  128             Wellington, New Zealand                71.52
## 129  129        Asheville, NC, United States                71.52
## 130  130                      Trieste, Italy                71.51
## 131  131       Fort Myers, FL, United States                71.50
## 132  132                Newcastle, Australia                71.42
## 133  133          Portsmouth, United Kingdom                71.04
## 134  134                     Halifax, Canada                70.88
## 135  135                     Vienna, Austria                70.86
## 136  136                 Heidelberg, Germany                70.82
## 137  137     Indianapolis, IN, United States                70.79
## 138  138           Edinburgh, United Kingdom                70.73
## 139  139     Jacksonville, FL, United States                70.62
## 140  140          Buffalo, NY, United States                70.59
## 141  141          Olympia, WA, United States                70.57
## 142  142 Saint Petersburg, FL, United States                70.49
## 143  143           Austin, TX, United States                70.49
## 144  144                 Brisbane, Australia                70.46
## 146  146                       Sliema, Malta                70.33
## 147  147        Rochester, NY, United States                70.25
## 148  148           Christchurch, New Zealand                70.23
## 149  149                     Toronto, Canada                70.19
## 150  150          Orlando, FL, United States                70.18
## 151  151                Dunedin, New Zealand                70.16
## 152  152                      Turku, Finland                70.13
## 153  153            Plymouth, United Kingdom                70.02
## 154  154             Swindon, United Kingdom                69.92
## 155  155                 Canberra, Australia                69.88
## 156  156          Manchester, United Kingdom                69.86
## 157  157           Peoria, IL, United States                69.84
## 158  158                  Gothenburg, Sweden                69.77
## 159  159        Cleveland, OH, United States                69.65
## 160  160                   Vancouver, Canada                69.63
## 161  161                   Limerick, Ireland                69.63
## 162  162             Bristol, United Kingdom                69.58
## 163  163            Brighton, United Kingdom                69.54
## 164  164                      Bologna, Italy                69.50
## 165  165                York, United Kingdom                69.33
## 166  166                  Karlsruhe, Germany                69.26
## 167  167          Raleigh, NC, United States                69.18
## 168  168                       Bonn, Germany                69.14
## 169  169                   Hobart, Australia                69.10
## 170  170        Arlington, TX, United States                69.07
## 171  171                         Rome, Italy                69.03
## 172  172      Saint Louis, MO, United States                69.02
## 173  173                     Bremen, Germany                68.93
## 174  174                     Calgary, Canada                68.93
## 175  175        Milwaukee, WI, United States                68.81
## 176  176                    Brampton, Canada                68.79
## 177  177        Nashville, TN, United States                68.78
## 178  178                     Uppsala, Sweden                68.75
## 179  179            Tampa, FL, United States                68.61
## 180  180                      Regina, Canada                68.46
## 181  181                   Mannheim, Germany                68.35
## 182  182               Leeds, United Kingdom                68.26
## 183  183   Virginia Beach, VA, United States                67.86
## 184  184                     Berlin, Germany                67.75
## 185  185                       Lille, France                67.73
## 186  186         Syracuse, NY, United States                67.55
## 187  187                  Stuttgart, Germany                67.46
## 188  188                   Coquitlam, Canada                67.43
## 189  189                    Red Deer, Canada                67.42
## 190  190                    Cologne, Germany                67.36
## 191  191                     Aachen, Germany                67.33
## 192  192      Tallahassee, FL, United States                67.24
## 193  193      Bakersfield, CA, United States                67.11
## 194  194        Ann Arbor, MI, United States                67.06
## 195  195          Nottingham, United Kingdom                67.05
## 196  196                    Edmonton, Canada                67.03
## 197  197        Las Vegas, NV, United States                66.98
## 198  198         Columbus, OH, United States                66.90
## 199  199                        Turin, Italy                66.68
## 200  200          Spokane, WA, United States                66.60
## 201  201                     Kelowna, Canada                66.60
## 202  202              Exeter, United Kingdom                66.56
## 203  203             Glasgow, United Kingdom                66.50
## 204  204          Memphis, TN, United States                66.49
## 205  205                    Kingston, Canada                66.45
## 206  206                  Nuremberg, Germany                66.44
## 207  207            Coventry, United Kingdom                66.31
## 208  208         Columbia, SC, United States                66.23
## 209  209                    Victoria, Canada                66.17
## 210  210                       Malmo, Sweden                66.14
## 211  211            Salem, OR, United States                66.04
## 212  212                    Leipzig, Germany                66.04
## 213  213                    Dresden, Germany                65.92
## 214  214       Fort Wayne, IN, United States                65.88
## 215  215           Dayton, OH, United States                65.84
## 216  216               San Juan, Puerto Rico                65.79
## 217  217                      Taipei, Taiwan                65.75
## 218  218      Kansas City, MO, United States                65.74
## 219  219           Leicester, United Kingdom                65.59
## 220  220                      Oshawa, Canada                65.44
## 221  221                 Nanaimo, BC, Canada                65.28
## 222  222       Fort Worth, TX, United States                65.19
## 223  223            Palma de Mallorca, Spain                65.17
## 224  224                 Mississauga, Canada                65.08
## 225  225                 Quebec City, Canada                65.07
## 226  226             Norwich, United Kingdom                64.95
## 227  227                     Burnaby, Canada                64.94
## 228  228     Fayetteville, AR, United States                64.84
## 230  230               Derby, United Kingdom                64.70
## 231  231                   Marseille, France                64.64
## 233  233                    Hanover, Germany                64.57
## 234  234         Richmond, VA, United States                64.56
## 235  235               Gold Coast, Australia                64.53
## 236  236       Greensboro, NC, United States                64.46
## 237  237          Birmingham, United Kingdom                64.46
## 238  238                     Windsor, Canada                64.42
## 239  239           Dallas, TX, United States                64.32
## 240  240      Albuquerque, NM, United States                64.32
## 241  241          Phoenix, AZ, United States                64.31
## 242  242         Southampton, United Kingdom                63.73
## 243  243      Gainesville, FL, United States                63.62
## 244  244                    Montreal, Canada                63.52
## 245  245     Grand Rapids, MI, United States                63.47
## 246  246           Tucson, AZ, United States                63.35
## 247  247          Madison, WI, United States                63.30
## 248  248      Chattanooga, TN, United States                63.28
## 249  249           Fresno, CA, United States                63.25
## 250  250          Wichita, KS, United States                63.18
## 251  251                    Winnipeg, Canada                63.15
## 252  252                     Cagliari, Italy                63.15
## 253  253   Salt Lake City, UT, United States                62.94
## 254  254                      Ottawa, Canada                62.88
## 255  255                         Doha, Qatar                62.81
## 256  256          Detroit, MI, United States                62.77
## 257  257 Newcastle upon Tyne, United Kingdom                62.76
## 258  258            Tulsa, OK, United States                62.67
## 259  259       Cincinnati, OH, United States                62.65
## 260  260           Sheffield, United Kingdom                62.64
## 261  261             Belfast, United Kingdom                62.42
## 262  262          Lubbock, TX, United States                62.40
## 264  264       Des Moines, IA, United States                62.21
## 265  265          Houston, TX, United States                62.16
## 267  267             Cardiff, United Kingdom                62.12
## 268  268           Liverpool, United Kingdom                62.00
## 269  269     Abu Dhabi, United Arab Emirates                61.94
## 270  270    Oklahoma City, OK, United States                61.72
## 272  272                     Moncton, Canada                61.15
## 274  274        Knoxville, TN, United States                60.97
## 276  276                    Hamilton, Canada                60.75
## 277  277      Springfield, MO, United States                60.56
## 278  278        Vancouver, WA, United States                60.46
## 280  280           Toledo, OH, United States                60.35
## 281  281      Little Rock, AR, United States                60.31
## 282  282       Louisville, KY, United States                60.24
## 283  283                       Madrid, Spain                60.12
## 284  284             Reno, NV, United States                59.84
## 285  285       Huntsville, AL, United States                59.80
## 286  286        Lexington, KY, United States                59.64
## 288  288            Boise, ID, United States                59.43
## 289  289          El Paso, TX, United States                59.37
## 290  290                      Surrey, Canada                59.18
## 291  291                      London, Canada                59.15
## 292  292                  Abbotsford, Canada                58.95
## 293  293                   Kitchener, Canada                58.93
## 294  294      San Antonio, TX, United States                58.12
## 315  315         Dubai, United Arab Emirates                53.32
##     Rent.Index Cost.of.Living.Plus.Rent.Index Groceries.Index
## 25       36.41                          61.89           81.72
## 26       47.60                          67.13           73.77
## 27       23.31                          55.32           65.29
## 30       24.92                          55.09           62.32
## 31       54.65                          69.13           62.35
## 32       33.01                          58.79           93.57
## 33       31.71                          58.16           61.47
## 34       70.30                          76.10           57.74
## 36       35.69                          59.34           61.31
## 38       60.38                          70.92           66.82
## 39       60.12                          70.73           60.82
## 40       62.58                          71.72           68.63
## 41       41.58                          61.73           83.41
## 42       31.01                          56.48           77.50
## 43       49.35                          65.10           74.58
## 44       26.21                          54.03           68.46
## 45       34.45                          57.65           71.63
## 46       23.34                          52.35           73.56
## 47       65.75                          72.40           73.87
## 48       27.34                          54.02           69.55
## 49       55.18                          67.17           74.93
## 50       26.66                          53.59           67.39
## 51       70.45                          74.25           71.59
## 52       40.57                          59.96           62.34
## 53       29.08                          54.51           73.87
## 54       55.53                          67.01           70.69
## 55       40.18                          59.69           64.74
## 56       29.07                          54.42           63.10
## 57       53.54                          65.98           76.79
## 58       35.79                          57.36           58.82
## 59       39.11                          58.92           63.73
## 60       42.90                          60.67           66.39
## 61       34.34                          56.60           60.65
## 62       26.10                          52.54           67.34
## 63       37.46                          57.92           58.34
## 64       23.03                          51.09           66.45
## 65       76.61                          76.43           71.10
## 66       41.81                          59.87           73.17
## 67       38.23                          58.15           71.89
## 68       29.77                          54.03           69.04
## 69       57.81                          67.30           67.27
## 70       32.03                          55.02           63.45
## 71       23.23                          50.82           71.92
## 72       68.66                          72.29           67.52
## 73       44.29                          60.75           69.09
## 74       23.02                          50.64           65.79
## 75       20.01                          49.17           63.25
## 76       25.78                          51.85           57.88
## 77       33.44                          55.38           65.24
## 78       25.38                          51.45           61.20
## 79       42.40                          59.47           72.45
## 80       42.16                          59.34           70.55
## 81       78.33                          76.44           74.88
## 82       30.67                          53.84           61.87
## 83       28.04                          52.55           59.51
## 84       33.80                          55.26           56.34
## 85       22.37                          49.84           68.32
## 86       42.73                          59.48           67.10
## 87       34.60                          55.60           61.79
## 88       43.44                          59.72           72.61
## 89       26.16                          51.49           72.37
## 90       38.62                          57.36           71.42
## 91       50.67                          63.05           69.19
## 92       33.42                          54.83           53.99
## 93       24.82                          50.76           62.71
## 94       21.80                          49.32           70.28
## 95       39.56                          57.63           59.19
## 96       32.10                          54.10           59.93
## 97       42.89                          59.20           68.71
## 98       45.18                          60.25           56.28
## 99       31.47                          53.75           58.58
## 100      41.21                          58.27           67.00
## 101      34.02                          54.83           61.77
## 102      37.58                          56.51           57.77
## 103      21.74                          48.99           60.51
## 104      19.47                          47.88           55.23
## 105      41.65                          58.33           69.21
## 106      32.42                          53.86           64.86
## 107      27.95                          51.69           57.21
## 108      32.84                          53.99           53.33
## 109      46.18                          60.27           68.29
## 110      31.99                          53.54           67.23
## 111      34.10                          54.49           56.19
## 112      43.84                          58.99           54.62
## 113      48.82                          61.34           51.41
## 114      35.59                          55.01           64.71
## 115      30.44                          52.57           78.36
## 116      21.78                          48.42           62.75
## 117      28.84                          51.72           58.44
## 118      61.06                          66.97           64.11
## 119      33.39                          53.80           54.27
## 120      35.25                          54.68           54.35
## 121      34.17                          54.17           68.93
## 122      46.89                          60.14           66.94
## 123      54.09                          63.53           67.92
## 124      45.24                          59.30           70.22
## 125      23.11                          48.81           61.23
## 126      34.03                          53.96           69.40
## 127      34.99                          54.29           53.12
## 128      39.68                          56.45           63.85
## 129      37.19                          55.27           71.47
## 130      19.64                          46.96           64.67
## 131      33.45                          53.49           68.78
## 132      37.63                          55.43           63.56
## 133      31.44                          52.29           51.81
## 134      28.05                          50.60           72.43
## 135      32.48                          52.70           63.61
## 136      33.51                          53.16           53.85
## 137      34.81                          53.76           67.20
## 138      33.44                          53.08           58.75
## 139      31.36                          52.04           69.00
## 140      29.30                          51.04           62.31
## 141      40.40                          56.28           60.02
## 142      40.59                          56.33           66.03
## 143      50.35                          60.96           65.81
## 144      39.13                          55.63           60.45
## 146      35.72                          53.94           55.05
## 147      30.81                          51.58           69.88
## 148      26.28                          49.42           61.00
## 149      44.28                          57.92           64.15
## 150      38.43                          55.15           68.50
## 151      21.81                          47.27           60.78
## 152      22.11                          47.40           53.18
## 153      20.31                          46.49           58.63
## 154      29.46                          50.77           49.50
## 155      40.63                          56.03           63.26
## 156      30.37                          51.17           52.69
## 157      25.55                          48.88           68.44
## 158      29.33                          50.62           60.31
## 159      28.24                          50.05           62.06
## 160      49.26                          59.98           66.65
## 161      28.14                          49.99           60.78
## 162      36.53                          53.93           52.44
## 163      42.42                          56.70           52.95
## 164      24.03                          47.98           54.96
## 165      28.87                          50.18           55.98
## 166      21.71                          46.75           52.43
## 167      36.18                          53.56           71.88
## 168      27.28                          49.32           52.20
## 169      27.95                          49.62           64.66
## 170      30.98                          51.04           64.58
## 171      36.69                          53.72           55.28
## 172      29.42                          50.28           65.14
## 173      21.86                          46.65           53.13
## 174      29.85                          50.43           60.75
## 175      35.57                          53.07           63.74
## 176      28.91                          49.91           68.60
## 177      49.17                          59.50           64.10
## 178      25.43                          48.24           58.12
## 179      39.54                          54.85           65.38
## 180      28.00                          49.31           66.75
## 181      22.17                          46.49           52.00
## 182      28.05                          49.23           53.36
## 183      35.84                          52.70           62.06
## 184      31.64                          50.65           52.31
## 185      22.98                          46.55           52.70
## 186      33.60                          51.48           63.81
## 187      33.30                          51.29           49.06
## 188      35.02                          52.09           66.05
## 189      23.58                          46.66           55.68
## 190      29.64                          49.51           51.53
## 191      22.76                          46.23           52.03
## 192      26.47                          47.94           71.30
## 193      28.95                          49.05           63.16
## 194      47.59                          57.84           60.70
## 195      23.63                          46.50           54.03
## 196      29.22                          49.13           60.51
## 197      29.55                          49.27           59.56
## 198      36.92                          52.71           58.94
## 199      20.97                          45.04           52.98
## 200      28.33                          48.49           59.19
## 201      33.08                          50.73           62.58
## 202      29.55                          49.04           48.27
## 203      27.49                          48.04           51.88
## 204      26.58                          47.60           59.36
## 205      26.88                          47.72           64.50
## 206      24.08                          46.39           50.10
## 207      26.92                          47.66           52.61
## 208      27.73                          48.01           65.60
## 209      38.10                          52.88           65.05
## 210      26.09                          47.18           56.60
## 211      28.93                          48.48           61.63
## 212      19.98                          44.24           50.44
## 213      21.68                          44.98           50.52
## 214      21.74                          44.98           70.07
## 215      21.97                          45.07           62.60
## 216      24.43                          46.21           59.19
## 217      22.74                          45.39           73.78
## 218      30.53                          49.07           58.43
## 219      22.41                          45.15           51.01
## 220      27.37                          47.42           55.97
## 221      24.29                          45.88           68.45
## 222      35.53                          51.15           56.86
## 223      27.12                          47.16           50.72
## 224      35.79                          51.22           58.39
## 225      16.10                          41.89           62.78
## 226      23.69                          45.42           48.98
## 227      40.95                          53.59           58.52
## 228      25.90                          46.41           61.15
## 230      19.76                          43.43           51.11
## 231      23.63                          45.23           54.31
## 233      22.82                          44.80           53.06
## 234      35.24                          50.68           63.54
## 235      37.37                          51.68           59.94
## 236      27.34                          46.89           63.03
## 237      30.50                          48.38           48.03
## 238      21.98                          44.33           51.65
## 239      43.15                          54.30           58.50
## 240      27.29                          46.79           64.42
## 241      33.65                          49.79           56.58
## 242      31.44                          48.45           48.32
## 243      29.02                          47.24           60.52
## 244      25.25                          45.40           60.69
## 245      31.04                          48.12           55.26
## 246      23.63                          44.55           52.48
## 247      37.52                          51.09           56.66
## 248      29.58                          47.33           57.19
## 249      30.12                          47.57           54.68
## 250      23.45                          44.38           57.30
## 251      23.70                          44.48           57.33
## 252      19.23                          42.36           55.09
## 253      35.80                          50.10           55.93
## 254      30.26                          47.44           54.70
## 255      56.39                          59.77           51.33
## 256      34.22                          49.25           56.21
## 257      22.89                          43.89           45.04
## 258      26.87                          45.72           59.49
## 259      31.03                          47.68           52.40
## 260      23.00                          43.88           49.09
## 261      22.62                          43.58           50.78
## 262      24.28                          44.35           56.80
## 264      33.57                          48.66           57.09
## 265      43.11                          53.14           54.36
## 267      28.79                          46.34           52.30
## 268      24.72                          44.35           44.70
## 269      58.43                          60.28           50.11
## 270      25.72                          44.68           60.18
## 272      17.69                          40.58           54.08
## 274      28.75                          45.72           59.45
## 276      26.34                          44.46           53.08
## 277      18.66                          40.73           60.68
## 278      35.97                          48.87           50.54
## 280      21.26                          41.84           50.89
## 281      26.40                          44.26           55.44
## 282      26.86                          44.44           53.87
## 283      31.59                          46.62           45.69
## 284      38.03                          49.51           51.96
## 285      28.65                          45.06           58.83
## 286      24.86                          43.17           54.50
## 288      30.85                          45.90           50.93
## 289      22.16                          41.76           54.07
## 290      30.36                          45.54           51.61
## 291      23.08                          42.08           47.61
## 292      25.01                          42.89           54.08
## 293      25.38                          43.05           51.13
## 294      31.26                          45.41           55.20
## 315      49.32                          51.42           37.47
##     Restaurant.Price.Index Local.Purchasing.Power.Index
## 25                   54.41                       113.09
## 26                   88.11                        95.38
## 27                  112.90                       114.26
## 30                   97.34                       113.36
## 31                   87.71                        98.88
## 32                   50.34                       102.63
## 33                   95.15                       116.80
## 34                   91.85                       100.22
## 36                   94.99                       108.83
## 38                   59.40                        99.15
## 39                   87.98                        89.32
## 40                   69.34                       128.25
## 41                   72.82                        84.71
## 42                   77.64                       108.77
## 43                   74.75                       109.34
## 44                   79.47                       114.89
## 45                   78.53                        93.47
## 46                   72.47                       108.39
## 47                   73.72                       135.16
## 48                   72.77                        96.07
## 49                   77.97                       128.82
## 50                   80.73                        99.34
## 51                   81.71                       114.51
## 52                   85.86                        93.67
## 53                   83.57                        99.44
## 54                   78.52                       133.70
## 55                   85.51                       115.83
## 56                   88.19                        70.47
## 57                   68.35                       112.76
## 58                   84.91                       102.30
## 59                   84.93                       125.69
## 60                   65.02                       103.52
## 61                   85.41                        85.39
## 62                   77.60                        83.45
## 63                   88.94                       103.12
## 64                   74.72                       105.57
## 65                   83.14                       170.91
## 66                   78.69                        76.97
## 67                   66.74                       114.28
## 68                   84.70                       112.81
## 69                   81.89                        89.99
## 70                   87.07                       100.24
## 71                   60.92                       100.33
## 72                   91.99                       124.41
## 73                   77.91                       145.88
## 74                   75.80                       100.44
## 75                   77.18                        77.62
## 76                   88.45                        94.77
## 77                   79.28                       139.93
## 78                   86.36                        97.30
## 79                   85.71                       122.77
## 80                   82.50                       119.13
## 81                   54.05                        76.49
## 82                   71.50                        95.54
## 83                   80.36                        96.92
## 84                   84.44                        93.41
## 85                   46.37                       102.10
## 86                   70.76                       131.85
## 87                   81.23                       125.99
## 88                   73.78                       119.38
## 89                   65.25                       103.89
## 90                   71.47                       130.05
## 91                   71.60                       126.03
## 92                   81.15                       111.02
## 93                   70.81                        94.37
## 94                   81.11                        96.78
## 95                   84.57                        74.87
## 96                   72.83                       104.75
## 97                   77.01                       127.77
## 98                   80.50                       114.57
## 99                   90.89                       121.22
## 100                  86.02                       106.74
## 101                  75.27                        94.56
## 102                  74.67                       109.85
## 103                  72.30                        80.96
## 104                  86.23                       100.60
## 105                  76.67                       142.25
## 106                  72.71                       119.67
## 107                  90.52                       128.24
## 108                  67.20                       115.58
## 109                  75.64                       133.75
## 110                  68.26                       127.17
## 111                  83.88                       121.84
## 112                  86.14                       106.28
## 113                  77.46                        87.88
## 114                  78.11                       122.21
## 115                  67.68                        99.50
## 116                  71.65                       104.62
## 117                  81.94                        96.13
## 118                  79.21                       144.91
## 119                  79.83                       112.68
## 120                  70.09                       113.28
## 121                  71.96                       114.33
## 122                  73.06                       150.38
## 123                  76.90                       130.34
## 124                  74.59                       111.58
## 125                  71.79                       114.79
## 126                  69.34                       107.87
## 127                  74.50                       132.91
## 128                  64.54                       116.39
## 129                  70.69                       104.81
## 130                  71.20                        91.24
## 131                  77.88                       104.54
## 132                  79.19                       142.12
## 133                  87.08                       107.73
## 134                  61.05                        99.86
## 135                  67.94                       104.56
## 136                  66.51                       135.30
## 137                  71.87                       109.93
## 138                  80.86                       110.16
## 139                  67.63                       132.56
## 140                  72.75                       111.16
## 141                  78.68                       135.82
## 142                  72.96                       127.77
## 143                  78.34                       151.25
## 144                  69.33                       134.54
## 146                  82.28                        70.43
## 147                  71.98                        91.12
## 148                  70.54                       111.52
## 149                  67.53                        99.45
## 150                  69.67                       130.10
## 151                  64.07                       112.89
## 152                  81.05                       126.99
## 153                  71.32                       111.90
## 154                  81.79                       128.46
## 155                  70.06                       153.77
## 156                  80.84                       107.70
## 157                  63.92                       118.14
## 158                  75.49                       122.33
## 159                  69.68                       105.12
## 160                  67.35                        94.65
## 161                  67.61                        98.85
## 162                  87.30                       117.20
## 163                  78.93                        87.36
## 164                  78.34                        85.60
## 165                  78.14                       113.55
## 166                  74.86                       161.95
## 167                  66.40                       155.96
## 168                  67.80                       112.56
## 169                  76.92                       124.03
## 170                  62.75                       141.64
## 171                  78.14                        72.99
## 172                  71.31                       149.05
## 173                  67.53                       126.88
## 174                  71.93                       138.51
## 175                  71.41                       107.87
## 176                  58.42                        99.86
## 177                  76.79                       136.29
## 178                  76.33                       122.17
## 179                  72.99                       140.97
## 180                  59.29                       112.05
## 181                  66.93                       141.04
## 182                  80.41                       119.62
## 183                  71.73                       161.28
## 184                  58.53                       112.36
## 185                  66.87                        97.87
## 186                  68.60                        94.96
## 187                  64.14                       130.11
## 188                  58.84                       124.45
## 189                  65.18                       140.16
## 190                  66.42                       133.27
## 191                  59.44                       134.85
## 192                  59.97                       128.82
## 193                  70.58                       151.58
## 194                  58.50                       128.99
## 195                  66.60                       106.22
## 196                  69.57                       129.45
## 197                  72.20                       144.40
## 198                  66.04                       128.77
## 199                  72.24                        86.70
## 200                  68.65                       124.45
## 201                  61.82                       108.98
## 202                  78.62                        87.24
## 203                  75.35                       121.47
## 204                  70.42                       125.07
## 205                  60.41                       113.98
## 206                  66.17                       120.91
## 207                  68.35                       138.99
## 208                  67.08                       124.84
## 209                  59.95                       106.89
## 210                  72.21                       107.14
## 211                  63.28                       125.24
## 212                  57.36                        90.74
## 213                  56.77                       131.77
## 214                  63.82                       124.37
## 215                  64.97                        91.21
## 216                  56.46                       110.36
## 217                  32.95                        95.59
## 218                  68.12                       138.60
## 219                  71.76                       107.34
## 220                  68.51                       119.92
## 221                  58.51                       100.45
## 222                  70.27                       140.43
## 223                  66.04                        78.81
## 224                  60.01                       112.72
## 225                  60.07                       140.18
## 226                  76.45                        92.06
## 227                  59.61                       151.02
## 228                  67.22                       109.58
## 230                  67.14                       146.98
## 231                  63.64                        92.65
## 233                  60.00                       152.96
## 234                  62.47                       132.62
## 235                  64.12                       129.83
## 236                  61.80                       133.53
## 237                  80.25                       106.94
## 238                  68.38                       109.87
## 239                  68.02                       153.42
## 240                  63.21                       128.27
## 241                  72.47                       146.15
## 242                  70.79                       139.02
## 243                  58.47                       106.34
## 244                  61.07                       117.12
## 245                  71.44                       129.66
## 246                  63.98                       122.68
## 247                  65.73                       144.61
## 248                  60.41                       124.02
## 249                  76.08                       120.12
## 250                  64.33                       135.99
## 251                  58.50                       115.79
## 252                  64.01                        88.55
## 253                  66.10                       150.76
## 254                  62.10                       144.70
## 255                  61.18                       139.76
## 256                  51.65                        97.41
## 257                  70.56                       133.83
## 258                  62.36                       129.54
## 259                  63.41                       137.31
## 260                  71.97                       119.46
## 261                  77.19                       100.69
## 262                  64.34                       135.19
## 264                  63.36                       128.68
## 265                  72.49                       155.88
## 267                  67.16                       116.48
## 268                  67.48                       121.31
## 269                  63.20                       116.42
## 270                  56.84                       136.21
## 272                  60.71                       112.73
## 274                  59.43                       116.61
## 276                  62.20                       127.16
## 277                  61.21                       102.88
## 278                  61.81                       153.07
## 280                  55.69                       125.57
## 281                  63.52                       144.07
## 282                  66.45                       123.93
## 283                  64.44                        91.36
## 284                  62.27                       136.81
## 285                  60.20                       162.04
## 286                  60.08                       141.91
## 288                  63.79                       120.44
## 289                  59.41                       131.70
## 290                  57.55                        93.91
## 291                  63.25                       118.79
## 292                  59.78                       111.27
## 293                  58.73                       129.74
## 294                  52.09                       150.96
## 315                  54.61                       153.68
#sqrt(rowSums(data[,3:8] - fitted(myKmean)) ^ 2)

Write up:

In order to discover strong patterns from our large data set, we conduct a principal component analysis. Moreover, to conduct the analysis, non-numeric data was removed as well as rank (since rank and cost of living index are 100% correlated). We begin our analysis by constructing a biplot (loading plot) to visualize how strongly each characteristic influences the first two principal components. Although the biplot is somewhat hard to read, we see that almost all variables are strongly influencing the second principal component, with the exception being Purchasing.Power.Index which is more evenly inluencing both of the first two principal components. The biplot also shows us how characteristics correlate with one another, and so it seems purchasing power index has a low correlation with all the other variables, yet those variables are all highly correlated with one another. In an attempt to gain more information we plot a 2D-projection of all the principal components and realize very little useful information. To analyze our principal coponents further, we look at the summary statistics for our analysis to see which principal components we can toss out. By the Kaiser method (SD>1) we should retain just one principal component. However if we wish to retain at least 90% of the variance in the data we should retain two principal components, which is supported by our scree plots. Therefore we interpret the weights of the first two principal components. Judging the first principal component, we notice high negative loadings on all the variables, meaning all variables are negatively correlates with each other. Thus the loadings on the first principal component seem to represent places where it is very expensive to live despite the low correlation between the various predictor variables. Futhermore, the loadings on the second principal component seem to represent places where it is very expensive to live yet your money goea a lot further in terms of purchasing power. Clearly, there is some distinct grouping in this data set. That is, cities are grouped based on some distinct characteristics contributing to their ranks. This is well vizualized in our plotted projection of the retained components.
Now that we have simpified our data and found some patterns, we are going to classify these “unique” cities into clusters using K-means for further understanding. First we need to determine the number of clusters (k) to use. Here we find k by plotting our whithin group sum of squares and finding the “elbow” in the plot. Examinig our within group sum of squares plot we conclude a k equal to five should be used. Five is quite unexpected, since the plotted projection of the retained components seemingly forshadows two distinct groups. Next, we go ahead and run our k-means classifier using our chosen value for k, and plot the results. Our retained PC’s k-means cluster projection plot beautifully depicts five distinct groups. Finally we print out our groups and interpret the results of our k-means. These results are incredibly interesting. Broadly, the groups seem to be representative of regions of similar levels of wealth. This makes perfect sense, since you would expect cities in regions/nations of similar wealth to have a similar cost of living. Strikinginly, however, cities seem to be slightly grouped by the similar economic policy of their respective country. Our first cluster for instance, contains a high volume of the total cities from Switzerland, Bermuda, Iceland, and Norway, all of whom are famous for having significantly developed service sectors, especially their respective banking industries. This trent continues throughout the groups. Lastly, due to the large variance in cluster size, within groups sum of squares was not an accurate measure of perfomance, though when calculating the maximum euclidean distance from the centroids, we received similar values for all but one group.

Random Forest and Neural Network Regression

First draft Random Forest with no training/testing data seperation

library(randomForest)
## Warning: package 'randomForest' was built under R version 3.4.4
## randomForest 4.6-14
## Type rfNews() to see new features/changes/bug fixes.
## 
## Attaching package: 'randomForest'
## The following object is masked from 'package:ggplot2':
## 
##     margin
cityRate1 = randomForest(Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index, data = data, importance = TRUE, ntree = 500, mtry = 2)#limit randomise variable for forest
cityRate1
## 
## Call:
##  randomForest(formula = Cost.of.Living.Index ~ Rank + Rent.Index +      Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index +      Local.Purchasing.Power.Index, data = data, importance = TRUE,      ntree = 500, mtry = 2) 
##                Type of random forest: regression
##                      Number of trees: 500
## No. of variables tried at each split: 2
## 
##           Mean of squared residuals: 1.586516
##                     % Var explained: 99.6
importance(cityRate1)
##                                  %IncMSE IncNodePurity
## Rank                           26.913689    77952.8499
## Rent.Index                     10.203268    11153.4281
## Cost.of.Living.Plus.Rent.Index 17.310715    51061.0545
## Groceries.Index                15.532442    40390.3542
## Restaurant.Price.Index         14.534015    31795.2511
## Local.Purchasing.Power.Index    6.984636      677.7968
summary(cityRate1)
##                 Length Class  Mode     
## call              6    -none- call     
## type              1    -none- character
## predicted       536    -none- numeric  
## mse             500    -none- numeric  
## rsq             500    -none- numeric  
## oob.times       536    -none- numeric  
## importance       12    -none- numeric  
## importanceSD      6    -none- numeric  
## localImportance   0    -none- NULL     
## proximity         0    -none- NULL     
## ntree             1    -none- numeric  
## mtry              1    -none- numeric  
## forest           11    -none- list     
## coefs             0    -none- NULL     
## y               536    -none- numeric  
## test              0    -none- NULL     
## inbag             0    -none- NULL     
## terms             3    terms  call
prediction1 = predict(cityRate1, data)
solution1 = data.frame(City = data$City, Cost.of.Living.Index = prediction1)
solution1
##                                      City Cost.of.Living.Index
## 1                       Hamilton, Bermuda            127.41206
## 2                     Zurich, Switzerland            126.98194
## 3                      Basel, Switzerland            125.00242
## 4                   Lausanne, Switzerland            119.82280
## 5                       Bern, Switzerland            116.26170
## 6                     Geneva, Switzerland            119.26418
## 7                      Reykjavik, Iceland            111.93610
## 8                     Lugano, Switzerland            111.87094
## 9                       Stavanger, Norway            109.00475
## 10                           Oslo, Norway            105.82958
## 11                         Bergen, Norway            101.94797
## 12            New York, NY, United States             99.76272
## 13                      Trondheim, Norway            100.24034
## 14       San Francisco, CA, United States             98.39653
## 15            Honolulu, HI, United States             94.52752
## 16           Anchorage, AK, United States             93.62732
## 17            Brooklyn, NY, United States             91.09982
## 18          Washington, DC, United States             88.90063
## 19          Santa Rosa, CA, United States             87.34150
## 20                    Copenhagen, Denmark             87.80705
## 21          Charleston, SC, United States             87.09285
## 22                 Luxembourg, Luxembourg             86.44859
## 23            Bellevue, WA, United States             85.51103
## 24             Seattle, WA, United States             85.88889
## 25                           Tokyo, Japan             83.09603
## 26                          Paris, France             83.68454
## 27                        Odense, Denmark             84.55387
## 28            Berkeley, CA, United States             85.65315
## 29         Jersey City, NJ, United States             85.07813
## 30                       Aalborg, Denmark             81.93423
## 31                 Amsterdam, Netherlands             81.89656
## 32                     Seoul, South Korea             81.75789
## 33                         Arhus, Denmark             81.43718
## 34                 London, United Kingdom             80.75546
## 35             Oakland, CA, United States             81.49285
## 36                      Helsinki, Finland             80.92762
## 37              Boston, MA, United States             80.81146
## 38                   Singapore, Singapore             79.74701
## 39                        Dublin, Ireland             80.54777
## 40                      Sydney, Australia             79.60450
## 41            Hartford, CT, United States             80.91091
## 42              Albany, NY, United States             79.11913
## 43        Philadelphia, PA, United States             79.09637
## 44                       Tampere, Finland             78.61469
## 45          Milton Keynes, United Kingdom             78.19281
## 46                       Grenoble, France             77.61729
## 47              Irvine, CA, United States             78.38139
## 48                           Lyon, France             77.75320
## 49          Long Beach, CA, United States             78.03003
## 50                          Linz, Austria             77.51731
## 51         Los Angeles, CA, United States             77.97383
## 52                  Tel Aviv-Yafo, Israel             77.29822
## 53                         Barrie, Canada             77.46293
## 54             Chicago, IL, United States             77.29212
## 55                      Stockholm, Sweden             77.10927
## 56                        Florence, Italy             76.97345
## 57             Boulder, CO, United States             77.37075
## 58      The Hague (Den Haag), Netherlands             76.51000
## 59                Reading, United Kingdom             76.57707
## 60                  Auckland, New Zealand             76.14149
## 61                      Jerusalem, Israel             76.50359
## 62                       Bordeaux, France             76.25039
## 63                   Utrecht, Netherlands             76.30416
## 64                       Toulouse, France             75.82289
## 65            San Jose, CA, United States             76.68177
## 66          Burlington, VT, United States             76.26784
## 67          Pittsburgh, PA, United States             75.91152
## 68                           Nice, France             75.95871
## 69               Miami, FL, United States             76.36846
## 70                      Brussels, Belgium             75.85405
## 71                          Graz, Austria             75.03983
## 72       Santa Barbara, CA, United States             76.82575
## 73          Sacramento, CA, United States             75.34513
## 74                     Strasbourg, France             75.19221
## 75                           Genoa, Italy             74.76054
## 76                          Gent, Belgium             74.95447
## 77                       Perth, Australia             74.75849
## 78                       Antwerp, Belgium             74.92371
## 79            Portland, ME, United States             74.90684
## 80     West Palm Beach, FL, United States             74.77740
## 81                   Hong Kong, Hong Kong             75.71255
## 82                     Innsbruck, Austria             74.31923
## 83                        Leuven, Belgium             74.39491
## 84                    Leiden, Netherlands             74.35589
## 85                           Osaka, Japan             73.16713
## 86                   Melbourne, Australia             74.27834
## 87                   Bath, United Kingdom             74.50210
## 88             Everett, WA, United States             74.47842
## 89                      Saskatoon, Canada             74.18625
## 90              Tacoma, WA, United States             74.13872
## 91            Portland, OR, United States             74.30231
## 92                 Rotterdam, Netherlands             73.74794
## 93                    Montpellier, France             73.85323
## 94                 St. John's, NL, Canada             74.15560
## 95                           Milan, Italy             73.97799
## 96                Maastricht, Netherlands             73.79132
## 97           Baltimore, MD, United States             73.86615
## 98                        Munich, Germany             73.77635
## 99                         Espoo, Finland             73.81713
## 100        New Orleans, LA, United States             73.94830
## 101                       Galway, Ireland             73.68561
## 102                         Cork, Ireland             73.53507
## 103                         Padova, Italy             73.09378
## 104                         Haifa, Israel             72.79958
## 105          Charlotte, NC, United States             73.24371
## 106                    Burlington, Canada             73.10137
## 107              Aberdeen, United Kingdom             73.01478
## 108                   Dusseldorf, Germany             72.62219
## 109        Minneapolis, MN, United States             72.92552
## 110                   Adelaide, Australia             72.67219
## 111                Eindhoven, Netherlands             72.89095
## 112             Cambridge, United Kingdom             72.83399
## 113                Oxford, United Kingdom             72.23921
## 114                     Darwin, Australia             72.45754
## 115             Eugene, OR, United States             73.21414
## 116                        Nantes, France             72.17729
## 117                Groningen, Netherlands             72.50146
## 118          San Diego, CA, United States             72.97978
## 119                     Ramat Gan, Israel             72.17400
## 120                      Hamburg, Germany             72.09231
## 121         Bellingham, WA, United States             72.12690
## 122            Atlanta, GA, United States             72.03743
## 123             Denver, CO, United States             72.44953
## 124         Saint Paul, MN, United States             72.23577
## 125                 Hamilton, New Zealand             71.72857
## 126         Birmingham, AL, United States             71.80132
## 127                    Frankfurt, Germany             71.63831
## 128               Wellington, New Zealand             71.30979
## 129          Asheville, NC, United States             71.75946
## 130                        Trieste, Italy             71.39737
## 131         Fort Myers, FL, United States             71.71484
## 132                  Newcastle, Australia             71.46656
## 133            Portsmouth, United Kingdom             71.04043
## 134                       Halifax, Canada             70.90607
## 135                       Vienna, Austria             70.75145
## 136                   Heidelberg, Germany             70.45969
## 137       Indianapolis, IN, United States             70.79772
## 138             Edinburgh, United Kingdom             70.96488
## 139       Jacksonville, FL, United States             70.55341
## 140            Buffalo, NY, United States             70.57187
## 141            Olympia, WA, United States             70.58589
## 142   Saint Petersburg, FL, United States             70.56312
## 143             Austin, TX, United States             70.58423
## 144                   Brisbane, Australia             70.36494
## 145                        Male, Maldives             69.62966
## 146                         Sliema, Malta             70.44442
## 147          Rochester, NY, United States             70.49979
## 148             Christchurch, New Zealand             70.05708
## 149                       Toronto, Canada             70.33757
## 150            Orlando, FL, United States             70.48021
## 151                  Dunedin, New Zealand             69.72480
## 152                        Turku, Finland             69.81085
## 153              Plymouth, United Kingdom             69.87452
## 154               Swindon, United Kingdom             69.74465
## 155                   Canberra, Australia             69.77822
## 156            Manchester, United Kingdom             69.87495
## 157             Peoria, IL, United States             69.66678
## 158                    Gothenburg, Sweden             69.77949
## 159          Cleveland, OH, United States             69.71517
## 160                     Vancouver, Canada             70.25878
## 161                     Limerick, Ireland             69.71365
## 162               Bristol, United Kingdom             69.96574
## 163              Brighton, United Kingdom             69.86983
## 164                        Bologna, Italy             69.51935
## 165                  York, United Kingdom             69.44871
## 166                    Karlsruhe, Germany             69.02641
## 167            Raleigh, NC, United States             69.37312
## 168                         Bonn, Germany             69.00617
## 169                     Hobart, Australia             69.32950
## 170          Arlington, TX, United States             68.84682
## 171                           Rome, Italy             69.33667
## 172        Saint Louis, MO, United States             68.97036
## 173                       Bremen, Germany             68.91573
## 174                       Calgary, Canada             68.91708
## 175          Milwaukee, WI, United States             69.03895
## 176                      Brampton, Canada             69.02001
## 177          Nashville, TN, United States             69.26849
## 178                       Uppsala, Sweden             68.79336
## 179              Tampa, FL, United States             68.98862
## 180                        Regina, Canada             68.55178
## 181                     Mannheim, Germany             68.31155
## 182                 Leeds, United Kingdom             68.47694
## 183     Virginia Beach, VA, United States             67.86948
## 184                       Berlin, Germany             67.46907
## 185                         Lille, France             67.71313
## 186           Syracuse, NY, United States             67.89935
## 187                    Stuttgart, Germany             67.01813
## 188                     Coquitlam, Canada             67.41216
## 189                      Red Deer, Canada             67.19093
## 190                      Cologne, Germany             67.28599
## 191                       Aachen, Germany             66.88747
## 192        Tallahassee, FL, United States             67.17345
## 193        Bakersfield, CA, United States             67.08276
## 194          Ann Arbor, MI, United States             67.10476
## 195            Nottingham, United Kingdom             67.11182
## 196                      Edmonton, Canada             67.07351
## 197          Las Vegas, NV, United States             67.02126
## 198           Columbus, OH, United States             66.89510
## 199                          Turin, Italy             66.55604
## 200            Spokane, WA, United States             66.56097
## 201                       Kelowna, Canada             66.76512
## 202                Exeter, United Kingdom             66.39631
## 203               Glasgow, United Kingdom             66.50770
## 204            Memphis, TN, United States             66.47428
## 205                      Kingston, Canada             66.39095
## 206                    Nuremberg, Germany             66.33477
## 207              Coventry, United Kingdom             66.37245
## 208           Columbia, SC, United States             66.36337
## 209                      Victoria, Canada             66.59364
## 210                         Malmo, Sweden             66.23593
## 211              Salem, OR, United States             66.04445
## 212                      Leipzig, Germany             65.49996
## 213                      Dresden, Germany             65.71352
## 214         Fort Wayne, IN, United States             65.84871
## 215             Dayton, OH, United States             65.79360
## 216                 San Juan, Puerto Rico             65.49961
## 217                        Taipei, Taiwan             65.36464
## 218        Kansas City, MO, United States             65.70779
## 219             Leicester, United Kingdom             65.42341
## 220                        Oshawa, Canada             65.52501
## 221                   Nanaimo, BC, Canada             65.46862
## 222         Fort Worth, TX, United States             65.28142
## 223              Palma de Mallorca, Spain             65.20499
## 224                   Mississauga, Canada             65.26632
## 225                   Quebec City, Canada             64.42656
## 226               Norwich, United Kingdom             64.90609
## 227                       Burnaby, Canada             64.91131
## 228       Fayetteville, AR, United States             65.13595
## 229                         Naples, Italy             63.98890
## 230                 Derby, United Kingdom             64.48589
## 231                     Marseille, France             64.63494
## 232                     Kingston, Jamaica             63.77772
## 233                      Hanover, Germany             64.48676
## 234           Richmond, VA, United States             64.98956
## 235                 Gold Coast, Australia             64.94101
## 236         Greensboro, NC, United States             64.55888
## 237            Birmingham, United Kingdom             64.67446
## 238                       Windsor, Canada             64.44382
## 239             Dallas, TX, United States             64.98246
## 240        Albuquerque, NM, United States             64.52050
## 241            Phoenix, AZ, United States             64.40494
## 242           Southampton, United Kingdom             63.81532
## 243        Gainesville, FL, United States             63.80958
## 244                      Montreal, Canada             63.56625
## 245       Grand Rapids, MI, United States             63.69338
## 246             Tucson, AZ, United States             63.21996
## 247            Madison, WI, United States             63.56204
## 248        Chattanooga, TN, United States             63.30306
## 249             Fresno, CA, United States             63.81083
## 250            Wichita, KS, United States             63.10132
## 251                      Winnipeg, Canada             63.13878
## 252                       Cagliari, Italy             62.85427
## 253     Salt Lake City, UT, United States             63.18906
## 254                        Ottawa, Canada             62.82702
## 255                           Doha, Qatar             63.26906
## 256            Detroit, MI, United States             62.75877
## 257   Newcastle upon Tyne, United Kingdom             62.31438
## 258              Tulsa, OK, United States             62.75459
## 259         Cincinnati, OH, United States             62.66243
## 260             Sheffield, United Kingdom             62.74851
## 261               Belfast, United Kingdom             62.99184
## 262            Lubbock, TX, United States             62.52795
## 263                      Taichung, Taiwan             61.77048
## 264         Des Moines, IA, United States             62.51755
## 265            Houston, TX, United States             63.36193
## 266                      Barcelona, Spain             62.01661
## 267               Cardiff, United Kingdom             62.63438
## 268             Liverpool, United Kingdom             61.84959
## 269       Abu Dhabi, United Arab Emirates             63.12416
## 270      Oklahoma City, OK, United States             61.81479
## 271                        Palermo, Italy             60.93986
## 272                       Moncton, Canada             61.01361
## 273                       Nicosia, Cyprus             61.09188
## 274          Knoxville, TN, United States             61.15104
## 275                       Beirut, Lebanon             60.21434
## 276                      Hamilton, Canada             60.71004
## 277        Springfield, MO, United States             61.06075
## 278          Vancouver, WA, United States             60.59597
## 279                        Athens, Greece             59.28089
## 280             Toledo, OH, United States             60.04521
## 281        Little Rock, AR, United States             60.51593
## 282         Louisville, KY, United States             60.93239
## 283                         Madrid, Spain             60.51159
## 284               Reno, NV, United States             60.58451
## 285         Huntsville, AL, United States             60.27256
## 286          Lexington, KY, United States             59.74517
## 287    Port of Spain, Trinidad And Tobago             59.35143
## 288              Boise, ID, United States             59.96830
## 289            El Paso, TX, United States             59.57358
## 290                        Surrey, Canada             59.58670
## 291                        London, Canada             59.32988
## 292                    Abbotsford, Canada             59.30204
## 293                     Kitchener, Canada             59.22452
## 294        San Antonio, TX, United States             58.74306
## 295                   Montevideo, Uruguay             58.05436
## 296           Zaragoza (Saragossa), Spain             58.07346
## 297                  Thessaloniki, Greece             57.12082
## 298                  San Jose, Costa Rica             57.85657
## 299                      Limassol, Cyprus             58.03171
## 300                          Accra, Ghana             57.32064
## 301                     Kaohsiung, Taiwan             56.06781
## 302                   Ljubljana, Slovenia             56.08727
## 303                       Valencia, Spain             55.22659
## 304                       Manama, Bahrain             55.63212
## 305                      Tallinn, Estonia             54.99208
## 306                   Panama City, Panama             55.81164
## 307                         Amman, Jordan             54.49869
## 308              Seville (Sevilla), Spain             54.58853
## 309                       Larnaca, Cyprus             54.37315
## 310                      Lisbon, Portugal             53.98422
## 311                       Alicante, Spain             54.00460
## 312                        Split, Croatia             53.38860
## 313                     Bangkok, Thailand             53.20521
## 314         Sharjah, United Arab Emirates             53.23370
## 315           Dubai, United Arab Emirates             54.33863
## 316                       Rijeka, Croatia             52.33886
## 317                       Zagreb, Croatia             52.20375
## 318                   Makati, Philippines             51.23037
## 319                     Coimbra, Portugal             50.85606
## 320                          Muscat, Oman             51.73641
## 321               Al Khobar, Saudi Arabia             50.82139
## 322                     Funchal, Portugal             50.44808
## 323                          Riga, Latvia             50.25105
## 324                       Porto, Portugal             50.30981
## 325                       Shanghai, China             51.76786
## 326                        Granada, Spain             50.43295
## 327                         Malaga, Spain             50.64922
## 328                       Santiago, Chile             50.65069
## 329         Jeddah (Jiddah), Saudi Arabia             49.61942
## 330                 Addis Ababa, Ethiopia             50.21621
## 331                        Tartu, Estonia             49.63523
## 332                          Havana, Cuba             48.05666
## 333                        Quito, Ecuador             49.46383
## 334                     Maribor, Slovenia             48.83078
## 335         Santa Cruz de Tenerife, Spain             49.13502
## 336                  Riyadh, Saudi Arabia             48.70586
## 337                  Bratislava, Slovakia             48.58093
## 338                       Braga, Portugal             48.43102
## 339               Ad Dammam, Saudi Arabia             48.34871
## 340                    Vilnius, Lithuania             48.21014
## 341                Prague, Czech Republic             48.16557
## 342           Bandar Seri Begawan, Brunei             48.47808
## 343                      Harare, Zimbabwe             47.60459
## 344     Las Palmas de Gran Canaria, Spain             47.77642
## 345             San Salvador, El Salvador             47.34090
## 346                    Guayaquil, Ecuador             47.25221
## 347                         Baghdad, Iraq             47.10658
## 348                      Phuket, Thailand             47.15587
## 349                   Klaipeda, Lithuania             46.67158
## 350                      Kosice, Slovakia             46.40665
## 351                Pretoria, South Africa             45.96629
## 352     Santo Domingo, Dominican Republic             45.84758
## 353                     Kaunas, Lithuania             45.69901
## 354                     Windhoek, Namibia             46.23604
## 355                  Phnom Penh, Cambodia             45.65492
## 356            Johannesburg, South Africa             45.67001
## 357                       Osijek, Croatia             44.22639
## 358                  Brno, Czech Republic             44.88088
## 359                        Moscow, Russia             44.84748
## 360                    Selangor, Malaysia             44.10621
## 361                      Campinas, Brazil             43.97773
## 362             Guatemala City, Guatemala             44.46347
## 363               Dar es Salaam, Tanzania             44.00861
## 364               Petaling Jaya, Malaysia             44.28117
## 365                     Sao Paulo, Brazil             43.95434
## 366                Rio de Janeiro, Brazil             43.71884
## 367                      Brasilia, Brazil             44.35686
## 368                      Penang, Malaysia             43.82264
## 369                        Beijing, China             44.93812
## 370                     Budapest, Hungary             43.67249
## 371                        Gdansk, Poland             42.89925
## 372                 Johor Bahru, Malaysia             43.19220
## 373                     Pattaya, Thailand             42.86228
## 374                           Irbil, Iraq             42.41447
## 375                Kuala Lumpur, Malaysia             42.59999
## 376                        Warsaw, Poland             42.65125
## 377                       Shenzhen, China             43.30336
## 378                     Kuching, Malaysia             41.21497
## 379               Kota Kinabalu, Malaysia             42.13162
## 380          Peterborough, United Kingdom             41.61236
## 381                        Nairobi, Kenya             42.00714
## 382                    Jakarta, Indonesia             41.86113
## 383               Cape Town, South Africa             42.67229
## 384                       Bali, Indonesia             41.46844
## 385                            Lima, Peru             41.56094
## 386               Olomouc, Czech Republic             41.43719
## 387                        Gdynia, Poland             41.11060
## 388                        Recife, Brazil             40.39905
## 389                  Porto Alegre, Brazil             40.11121
## 390               Ostrava, Czech Republic             40.34089
## 391                  Chiang Mai, Thailand             40.92082
## 392                Belo Horizonte, Brazil             40.02858
## 393                  Durban, South Africa             40.62802
## 394                    Bucharest, Romania             40.43236
## 395                       Sofia, Bulgaria             40.36701
## 396                      Guangzhou, China             40.99614
## 397                 Florianopolis, Brazil             40.13104
## 398                      Belgrade, Serbia             39.95131
## 399                       Wroclaw, Poland             40.33291
## 400                 Podgorica, Montenegro             39.72085
## 401               Krakow (Cracow), Poland             39.73012
## 402          Port Elizabeth, South Africa             39.45391
## 403              Saint Petersburg, Russia             39.86446
## 404      Sarajevo, Bosnia And Herzegovina             39.00157
## 405                       Varna, Bulgaria             38.96599
## 406                        Poznan, Poland             39.04387
## 407                    Constanta, Romania             38.56452
## 408                        Rabat, Morocco             38.52791
## 409               Buenos Aires, Argentina             38.69484
## 410                     Bydgoszcz, Poland             38.48754
## 411                       Szeged, Hungary             38.36727
## 412                        Hanoi, Vietnam             38.39045
## 413                      Curitiba, Brazil             37.83413
## 414                    Timisoara, Romania             38.35665
## 415                  Cluj-Napoca, Romania             38.33733
## 416                     Debrecen, Hungary             37.90963
## 417                         Suzhou, China             38.42683
## 418                   Manila, Philippines             37.95618
## 419                      Istanbul, Turkey             37.92339
## 420             Ho Chi Minh City, Vietnam             38.33947
## 421                      Katowice, Poland             37.44571
## 422                      Szczecin, Poland             37.18320
## 423                   Chelyabinsk, Russia             37.21639
## 424                       Tirana, Albania             37.10484
## 425                          Lodz, Poland             37.15645
## 426                       Brasov, Romania             37.19041
## 427    Banja Luka, Bosnia And Herzegovina             36.14932
## 428                         Iasi, Romania             36.54432
## 429                     Plovdiv, Bulgaria             36.29766
## 430                     Cebu, Philippines             36.24426
## 431                 Yekaterinburg, Russia             36.51520
## 432                      Burgas, Bulgaria             36.09780
## 433                        Chengdu, China             36.32537
## 434                       Cuenca, Ecuador             36.16816
## 435                        Lublin, Poland             36.10381
## 436                    Colombo, Sri Lanka             36.10338
## 437                        Samara, Russia             35.96180
## 438                         Arad, Romania             35.70537
## 439                   Surabaya, Indonesia             35.51891
## 440                   Casablanca, Morocco             35.82791
## 441                        Sibiu, Romania             35.77076
## 442                    Bandung, Indonesia             35.48803
## 443                  Paramaribo, Suriname             35.48510
## 444                   Kaliningrad, Russia             35.38677
## 445                      Novi Sad, Serbia             35.01693
## 446                      Bogota, Colombia             35.03375
## 447                 Yogyakarta, Indonesia             35.03588
## 448                    Astana, Kazakhstan             35.18862
## 449                        Ankara, Turkey             34.54518
## 450                     Skopje, Macedonia             34.56061
## 451                       Oradea, Romania             34.34695
## 452                           Nis, Serbia             33.69531
## 453                          Tehran, Iran             34.52349
## 454                   Mexico City, Mexico             34.83677
## 455                 Ulaanbaatar, Mongolia             34.27350
## 456                     Monterrey, Mexico             34.41662
## 457                        Minsk, Belarus             34.04643
## 458               Nizhny Novgorod, Russia             34.08355
## 459                Barranquilla, Colombia             33.77038
## 460                         Izmir, Turkey             33.91164
## 461                    Medellin, Colombia             33.98490
## 462                       Antalya, Turkey             33.80350
## 463                     Chisinau, Moldova             33.61274
## 464                         Bursa, Turkey             33.39400
## 465                         Kazan, Russia             33.91063
## 466                   Novosibirsk, Russia             33.95217
## 467                    Davao, Philippines             33.53669
## 468                    Asuncion, Paraguay             33.53336
## 469                      Algiers, Algeria             33.81490
## 470                        Lagos, Nigeria             34.75175
## 471                Dumaguete, Philippines             33.54157
## 472                      Yerevan, Armenia             33.16588
## 473                       Tijuana, Mexico             32.88031
## 474                    Almaty, Kazakhstan             32.49004
## 475                Rostov-na-donu, Russia             32.55195
## 476                     Krasnodar, Russia             32.57752
## 477                      Kathmandu, Nepal             31.19392
## 478                      Craiova, Romania             31.64310
## 479                      Voronezh, Russia             31.76475
## 480              Quezon City, Philippines             31.58947
## 481                     Dhaka, Bangladesh             31.70874
## 482                       Kampala, Uganda             31.53582
## 483                   Guadalajara, Mexico             31.63811
## 484                        Cancun, Mexico             31.54395
## 485                     Queretaro, Mexico             31.37250
## 486                        Gurgaon, India             30.73212
## 487                        Cali, Colombia             30.27864
## 488                      Tbilisi, Georgia             30.26830
## 489                       Odessa, Ukraine             30.11027
## 490                  Tashkent, Uzbekistan             30.17879
## 491               Puerto Vallarta, Mexico             30.64817
## 492                         Kiev, Ukraine             29.94708
## 493                      Baku, Azerbaijan             29.88229
## 494                        Merida, Mexico             29.02831
## 495                         Mumbai, India             30.96550
## 496                        Puebla, Mexico             28.70904
## 497                          Delhi, India             28.95598
## 498                          Noida, India             28.44432
## 499                       Dnipro, Ukraine             28.03252
## 500                    Caracas, Venezuela             28.27932
## 501                           Pune, India             27.60634
## 502                         Lviv, Ukraine             27.44438
## 503                       Ludhiana, India             26.83082
## 504                      Bangalore, India             27.09653
## 505                      Kharkiv, Ukraine             26.93260
## 506                        Tunis, Tunisia             26.26434
## 507 Pristina, Kosovo (Disputed Territory)             26.24613
## 508                     Chandigarh, India             25.99243
## 509                   Islamabad, Pakistan             25.96858
## 510                      Lahore, Pakistan             25.96024
## 511                          Cairo, Egypt             25.85683
## 512                         Jaipur, India             25.17892
## 513                         Indore, India             25.32121
## 514                          Thane, India             25.84083
## 515                        Chennai, India             25.60197
## 516                        Kolkata, India             25.03302
## 517              Lucknow (Lakhnau), India             24.64763
## 518                            Goa, India             24.79853
## 519                      Ahmedabad, India             24.41087
## 520                     Alexandria, Egypt             24.05478
## 521                     Karachi, Pakistan             24.20715
## 522                         Sumy, Ukraine             23.48322
## 523                          Surat, India             23.82096
## 524                      Hyderabad, India             23.84720
## 525                         Nagpur, India             22.76399
## 526                       Guwahati, India             22.55710
## 527                         Mysore, India             22.53296
## 528                    Bhubaneswar, India             22.45826
## 529                      Mangalore, India             22.43153
## 530                     Coimbatore, India             22.42338
## 531                         Bhopal, India             22.29332
## 532                       Vadodara, India             22.34692
## 533                          Kochi, India             21.72453
## 534                  Visakhapatnam, India             21.96622
## 535                    Navi Mumbai, India             20.08061
## 536             Thiruvananthapuram, India             19.92843

Here we notice that the MSE of the random forest is quite low. The results of classifying the cities by cost of living is pretty accurate in many cases. Of course this is due to the fact that we are using the whole data set for both training the model and running the model.

Random Forest Analysis with test and training to predict Cost of Living

library(randomForest)
trainindex <- sample(1:nrow(data), 200)
train <- droplevels(data[trainindex, ])
test <- droplevels(data[-trainindex, ])
#cityRate2 = randomForest(Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index, data = train, ntree = 500, mtry = 2, importance = TRUE)#limit randomise variable for forest
cityRate2 = randomForest(Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data = train, ntree = 100, mtry = 2, importance = TRUE, do.trace=T)#limit randomise variable for forest, shown that rent and local purchasing power were not very important at all compared to other variables
##      |      Out-of-bag   |
## Tree |      MSE  %Var(y) |
##    1 |    15.33     4.31 |
##    2 |    10.66     3.00 |
##    3 |    7.978     2.24 |
##    4 |    7.721     2.17 |
##    5 |    6.738     1.90 |
##    6 |     6.56     1.85 |
##    7 |    7.385     2.08 |
##    8 |     7.03     1.98 |
##    9 |    8.426     2.37 |
##   10 |     7.11     2.00 |
##   11 |    6.892     1.94 |
##   12 |    6.444     1.81 |
##   13 |    6.218     1.75 |
##   14 |    5.919     1.67 |
##   15 |    5.667     1.59 |
##   16 |    5.724     1.61 |
##   17 |    5.028     1.41 |
##   18 |    4.882     1.37 |
##   19 |    4.889     1.38 |
##   20 |    4.784     1.35 |
##   21 |    4.767     1.34 |
##   22 |    4.988     1.40 |
##   23 |    4.792     1.35 |
##   24 |    4.618     1.30 |
##   25 |    4.388     1.23 |
##   26 |    4.404     1.24 |
##   27 |    4.611     1.30 |
##   28 |    4.592     1.29 |
##   29 |    4.449     1.25 |
##   30 |    4.462     1.26 |
##   31 |    4.498     1.27 |
##   32 |    4.682     1.32 |
##   33 |    4.647     1.31 |
##   34 |    4.582     1.29 |
##   35 |    4.787     1.35 |
##   36 |     4.76     1.34 |
##   37 |    4.738     1.33 |
##   38 |    4.707     1.32 |
##   39 |    4.696     1.32 |
##   40 |    4.673     1.32 |
##   41 |    4.693     1.32 |
##   42 |    4.681     1.32 |
##   43 |      4.7     1.32 |
##   44 |    4.736     1.33 |
##   45 |    4.722     1.33 |
##   46 |    4.711     1.33 |
##   47 |    4.586     1.29 |
##   48 |    4.591     1.29 |
##   49 |    4.583     1.29 |
##   50 |    4.503     1.27 |
##   51 |    4.625     1.30 |
##   52 |    4.603     1.30 |
##   53 |    4.582     1.29 |
##   54 |    4.578     1.29 |
##   55 |    4.796     1.35 |
##   56 |    4.834     1.36 |
##   57 |    4.812     1.35 |
##   58 |    4.842     1.36 |
##   59 |    4.839     1.36 |
##   60 |      4.8     1.35 |
##   61 |    4.654     1.31 |
##   62 |     4.64     1.31 |
##   63 |    4.586     1.29 |
##   64 |    4.579     1.29 |
##   65 |    4.508     1.27 |
##   66 |     4.51     1.27 |
##   67 |    4.517     1.27 |
##   68 |    4.506     1.27 |
##   69 |    4.509     1.27 |
##   70 |    4.562     1.28 |
##   71 |    4.581     1.29 |
##   72 |    4.571     1.29 |
##   73 |    4.533     1.28 |
##   74 |    4.486     1.26 |
##   75 |    4.479     1.26 |
##   76 |    4.502     1.27 |
##   77 |    4.501     1.27 |
##   78 |    4.505     1.27 |
##   79 |    4.415     1.24 |
##   80 |    4.422     1.24 |
##   81 |    4.479     1.26 |
##   82 |    4.491     1.26 |
##   83 |      4.5     1.27 |
##   84 |    4.489     1.26 |
##   85 |    4.498     1.27 |
##   86 |    4.469     1.26 |
##   87 |    4.474     1.26 |
##   88 |    4.548     1.28 |
##   89 |    4.556     1.28 |
##   90 |    4.542     1.28 |
##   91 |    4.557     1.28 |
##   92 |    4.594     1.29 |
##   93 |    4.596     1.29 |
##   94 |    4.616     1.30 |
##   95 |    4.593     1.29 |
##   96 |    4.587     1.29 |
##   97 |    4.587     1.29 |
##   98 |    4.563     1.28 |
##   99 |     4.59     1.29 |
##  100 |    4.659     1.31 |
cityRate2
## 
## Call:
##  randomForest(formula = Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index +      Groceries.Index + Restaurant.Price.Index, data = train, ntree = 100,      mtry = 2, importance = TRUE, do.trace = T) 
##                Type of random forest: regression
##                      Number of trees: 100
## No. of variables tried at each split: 2
## 
##           Mean of squared residuals: 4.658718
##                     % Var explained: 98.69
importance(cityRate2)
##                                  %IncMSE IncNodePurity
## Rank                           12.571083     33650.779
## Cost.of.Living.Plus.Rent.Index  7.990728     22340.411
## Groceries.Index                 5.038499     10561.654
## Restaurant.Price.Index          3.830426      3277.884
summary(cityRate2)
##                 Length Class  Mode     
## call              7    -none- call     
## type              1    -none- character
## predicted       200    -none- numeric  
## mse             100    -none- numeric  
## rsq             100    -none- numeric  
## oob.times       200    -none- numeric  
## importance        8    -none- numeric  
## importanceSD      4    -none- numeric  
## localImportance   0    -none- NULL     
## proximity         0    -none- NULL     
## ntree             1    -none- numeric  
## mtry              1    -none- numeric  
## forest           11    -none- list     
## coefs             0    -none- NULL     
## y               200    -none- numeric  
## test              0    -none- NULL     
## inbag             0    -none- NULL     
## terms             3    terms  call
prediction2 = predict(cityRate2, test)
#prediction
solution2 = data.frame(City = test$City, Cost.of.Living.Index = prediction2)
solution2
##                                   City Cost.of.Living.Index
## 1                    Hamilton, Bermuda            104.03236
## 2                  Zurich, Switzerland            104.03236
## 3                   Basel, Switzerland            104.03236
## 4                Lausanne, Switzerland            104.03236
## 6                  Geneva, Switzerland            104.03236
## 7                   Reykjavik, Iceland            102.90031
## 8                  Lugano, Switzerland            102.90031
## 9                    Stavanger, Norway            100.13967
## 10                        Oslo, Norway             99.47534
## 11                      Bergen, Norway             97.72010
## 12         New York, NY, United States             98.31244
## 14    San Francisco, CA, United States             97.65965
## 16        Anchorage, AK, United States             91.52978
## 17         Brooklyn, NY, United States             95.49747
## 18       Washington, DC, United States             92.30344
## 19       Santa Rosa, CA, United States             89.50353
## 20                 Copenhagen, Denmark             89.24929
## 21       Charleston, SC, United States             87.29524
## 23         Bellevue, WA, United States             84.14185
## 24          Seattle, WA, United States             86.70293
## 26                       Paris, France             82.50453
## 27                     Odense, Denmark             85.11805
## 29      Jersey City, NJ, United States             85.96688
## 30                    Aalborg, Denmark             81.97470
## 32                  Seoul, South Korea             84.45318
## 33                      Arhus, Denmark             81.56025
## 34              London, United Kingdom             81.40358
## 35          Oakland, CA, United States             81.96229
## 36                   Helsinki, Finland             80.22119
## 37           Boston, MA, United States             80.78837
## 39                     Dublin, Ireland             80.27090
## 41         Hartford, CT, United States             82.11122
## 43     Philadelphia, PA, United States             78.86869
## 45       Milton Keynes, United Kingdom             78.35432
## 47           Irvine, CA, United States             78.82873
## 48                        Lyon, France             77.77949
## 51      Los Angeles, CA, United States             78.34391
## 52               Tel Aviv-Yafo, Israel             76.79567
## 53                      Barrie, Canada             77.45305
## 55                   Stockholm, Sweden             76.60722
## 56                     Florence, Italy             76.91077
## 58   The Hague (Den Haag), Netherlands             76.24380
## 60               Auckland, New Zealand             75.79287
## 61                   Jerusalem, Israel             76.05803
## 64                    Toulouse, France             75.65156
## 67       Pittsburgh, PA, United States             75.78153
## 68                        Nice, France             76.57109
## 69            Miami, FL, United States             76.28273
## 72    Santa Barbara, CA, United States             77.62234
## 73       Sacramento, CA, United States             75.51519
## 74                  Strasbourg, France             74.48188
## 75                        Genoa, Italy             74.10887
## 80  West Palm Beach, FL, United States             75.03441
## 82                  Innsbruck, Austria             74.18050
## 85                        Osaka, Japan             73.42993
## 86                Melbourne, Australia             74.41385
## 88          Everett, WA, United States             74.73016
## 89                   Saskatoon, Canada             74.22029
## 90           Tacoma, WA, United States             74.41668
## 91         Portland, OR, United States             74.62424
## 94              St. John's, NL, Canada             73.98430
## 96             Maastricht, Netherlands             73.71090
## 97        Baltimore, MD, United States             74.24824
## 99                      Espoo, Finland             74.54327
## 101                    Galway, Ireland             73.84499
## 102                      Cork, Ireland             73.66031
## 103                      Padova, Italy             73.08508
## 105       Charlotte, NC, United States             73.84381
## 106                 Burlington, Canada             73.26976
## 107           Aberdeen, United Kingdom             73.94920
## 108                Dusseldorf, Germany             72.51661
## 110                Adelaide, Australia             72.85524
## 112          Cambridge, United Kingdom             73.05487
## 113             Oxford, United Kingdom             72.96034
## 114                  Darwin, Australia             72.86884
## 116                     Nantes, France             72.01849
## 117             Groningen, Netherlands             72.70068
## 119                  Ramat Gan, Israel             72.27245
## 120                   Hamburg, Germany             72.18772
## 121      Bellingham, WA, United States             72.85749
## 122         Atlanta, GA, United States             72.28870
## 123          Denver, CO, United States             73.01208
## 124      Saint Paul, MN, United States             72.51831
## 126      Birmingham, AL, United States             71.80205
## 127                 Frankfurt, Germany             71.05667
## 128            Wellington, New Zealand             70.28482
## 129       Asheville, NC, United States             71.55008
## 130                     Trieste, Italy             70.55674
## 131      Fort Myers, FL, United States             71.49963
## 132               Newcastle, Australia             71.00180
## 134                    Halifax, Canada             70.02871
## 135                    Vienna, Austria             70.40006
## 136                Heidelberg, Germany             69.65867
## 138          Edinburgh, United Kingdom             70.56909
## 139    Jacksonville, FL, United States             70.34468
## 140         Buffalo, NY, United States             70.29411
## 143          Austin, TX, United States             70.40685
## 144                Brisbane, Australia             70.04270
## 149                    Toronto, Canada             69.89328
## 150         Orlando, FL, United States             70.66464
## 151               Dunedin, New Zealand             68.40566
## 154            Swindon, United Kingdom             69.35422
## 155                Canberra, Australia             69.76497
## 157          Peoria, IL, United States             68.79248
## 158                 Gothenburg, Sweden             69.71944
## 162            Bristol, United Kingdom             69.75989
## 163           Brighton, United Kingdom             69.61314
## 164                     Bologna, Italy             69.14430
## 165               York, United Kingdom             69.15231
## 166                 Karlsruhe, Germany             68.68930
## 170       Arlington, TX, United States             68.22934
## 172     Saint Louis, MO, United States             69.02321
## 176                   Brampton, Canada             68.77261
## 178                    Uppsala, Sweden             68.63182
## 180                     Regina, Canada             68.20732
## 181                  Mannheim, Germany             68.03884
## 183  Virginia Beach, VA, United States             68.35326
## 187                 Stuttgart, Germany             66.64349
## 189                   Red Deer, Canada             67.11470
## 190                   Cologne, Germany             67.32092
## 191                    Aachen, Germany             66.35946
## 192     Tallahassee, FL, United States             66.74491
## 193     Bakersfield, CA, United States             67.41509
## 194       Ann Arbor, MI, United States             66.66783
## 196                   Edmonton, Canada             67.10056
## 197       Las Vegas, NV, United States             67.29387
## 198        Columbus, OH, United States             66.55040
## 199                       Turin, Italy             66.23837
## 200         Spokane, WA, United States             66.44899
## 201                    Kelowna, Canada             66.03472
## 204         Memphis, TN, United States             66.37594
## 205                   Kingston, Canada             65.59831
## 208        Columbia, SC, United States             66.31834
## 210                      Malmo, Sweden             66.30709
## 211           Salem, OR, United States             65.46990
## 212                   Leipzig, Germany             64.36551
## 213                   Dresden, Germany             64.51276
## 216              San Juan, Puerto Rico             64.89743
## 221                Nanaimo, BC, Canada             65.19104
## 222      Fort Worth, TX, United States             65.64619
## 223           Palma de Mallorca, Spain             65.50244
## 226            Norwich, United Kingdom             64.61817
## 228    Fayetteville, AR, United States             65.58823
## 229                      Naples, Italy             63.58837
## 231                  Marseille, France             64.55103
## 232                  Kingston, Jamaica             62.95247
## 233                   Hanover, Germany             64.37431
## 237         Birmingham, United Kingdom             64.62973
## 238                    Windsor, Canada             64.59054
## 239          Dallas, TX, United States             65.19157
## 241         Phoenix, AZ, United States             64.60788
## 243     Gainesville, FL, United States             63.95667
## 244                   Montreal, Canada             64.08488
## 245    Grand Rapids, MI, United States             64.20381
## 246          Tucson, AZ, United States             63.47436
## 247         Madison, WI, United States             64.02380
## 248     Chattanooga, TN, United States             63.12476
## 249          Fresno, CA, United States             63.74212
## 250         Wichita, KS, United States             62.81417
## 251                   Winnipeg, Canada             62.03058
## 252                    Cagliari, Italy             62.40669
## 254                     Ottawa, Canada             62.42389
## 256         Detroit, MI, United States             61.70124
## 258           Tulsa, OK, United States             62.56967
## 261            Belfast, United Kingdom             63.22099
## 262         Lubbock, TX, United States             62.50871
## 263                   Taichung, Taiwan             61.47106
## 267            Cardiff, United Kingdom             62.98387
## 269    Abu Dhabi, United Arab Emirates             63.12627
## 270   Oklahoma City, OK, United States             61.19552
## 271                     Palermo, Italy             60.71524
## 272                    Moncton, Canada             60.81166
## 274       Knoxville, TN, United States             60.73575
## 275                    Beirut, Lebanon             59.86382
## 276                   Hamilton, Canada             60.48480
## 278       Vancouver, WA, United States             61.29843
## 279                     Athens, Greece             57.43206
## 280          Toledo, OH, United States             59.57928
## 281     Little Rock, AR, United States             60.27400
## 283                      Madrid, Spain             60.83777
## 284            Reno, NV, United States             61.09048
## 286       Lexington, KY, United States             59.65141
## 287 Port of Spain, Trinidad And Tobago             58.53581
## 293                  Kitchener, Canada             58.94516
## 295                Montevideo, Uruguay             58.08831
## 296        Zaragoza (Saragossa), Spain             58.04704
## 297               Thessaloniki, Greece             55.60286
## 299                   Limassol, Cyprus             58.19133
## 303                    Valencia, Spain             54.98044
## 304                    Manama, Bahrain             57.47329
## 305                   Tallinn, Estonia             54.05103
## 306                Panama City, Panama             57.68228
## 307                      Amman, Jordan             53.91286
## 308           Seville (Sevilla), Spain             54.37064
## 309                    Larnaca, Cyprus             53.90266
## 311                    Alicante, Spain             53.43095
## 313                  Bangkok, Thailand             55.77512
## 315        Dubai, United Arab Emirates             56.76962
## 318                Makati, Philippines             51.91504
## 322                  Funchal, Portugal             49.88548
## 323                       Riga, Latvia             48.65663
## 324                    Porto, Portugal             50.05340
## 325                    Shanghai, China             53.48444
## 326                     Granada, Spain             49.31267
## 330              Addis Ababa, Ethiopia             51.18411
## 331                     Tartu, Estonia             49.05638
## 332                       Havana, Cuba             46.03940
## 333                     Quito, Ecuador             50.94840
## 334                  Maribor, Slovenia             47.43576
## 335      Santa Cruz de Tenerife, Spain             48.54857
## 336               Riyadh, Saudi Arabia             48.51464
## 337               Bratislava, Slovakia             48.59864
## 339            Ad Dammam, Saudi Arabia             46.68961
## 340                 Vilnius, Lithuania             46.93245
## 341             Prague, Czech Republic             48.05017
## 342        Bandar Seri Begawan, Brunei             48.92199
## 343                   Harare, Zimbabwe             46.91242
## 345          San Salvador, El Salvador             48.43129
## 346                 Guayaquil, Ecuador             47.01021
## 347                      Baghdad, Iraq             46.21447
## 349                Klaipeda, Lithuania             44.99345
## 350                   Kosice, Slovakia             45.61954
## 351             Pretoria, South Africa             45.19160
## 352  Santo Domingo, Dominican Republic             44.46692
## 353                  Kaunas, Lithuania             44.09563
## 355               Phnom Penh, Cambodia             47.18939
## 357                    Osijek, Croatia             43.43119
## 358               Brno, Czech Republic             45.30322
## 359                     Moscow, Russia             45.87213
## 360                 Selangor, Malaysia             43.54554
## 361                   Campinas, Brazil             43.20627
## 364            Petaling Jaya, Malaysia             43.99786
## 367                   Brasilia, Brazil             43.43004
## 368                   Penang, Malaysia             44.18023
## 370                  Budapest, Hungary             43.42781
## 371                     Gdansk, Poland             42.88627
## 373                  Pattaya, Thailand             43.85470
## 377                    Shenzhen, China             44.90151
## 379            Kota Kinabalu, Malaysia             42.36568
## 381                     Nairobi, Kenya             42.05067
## 383            Cape Town, South Africa             44.51920
## 384                    Bali, Indonesia             42.65253
## 387                     Gdynia, Poland             41.33786
## 388                     Recife, Brazil             40.87580
## 389               Porto Alegre, Brazil             40.62212
## 390            Ostrava, Czech Republic             40.65931
## 391               Chiang Mai, Thailand             42.64141
## 392             Belo Horizonte, Brazil             40.14269
## 393               Durban, South Africa             40.46790
## 394                 Bucharest, Romania             40.45230
## 395                    Sofia, Bulgaria             39.75071
## 396                   Guangzhou, China             41.25306
## 397              Florianopolis, Brazil             39.32208
## 399                    Wroclaw, Poland             40.08035
## 400              Podgorica, Montenegro             39.36841
## 401            Krakow (Cracow), Poland             39.58986
## 402       Port Elizabeth, South Africa             39.33117
## 406                     Poznan, Poland             39.20816
## 407                 Constanta, Romania             38.22172
## 408                     Rabat, Morocco             39.01396
## 409            Buenos Aires, Argentina             38.96663
## 410                  Bydgoszcz, Poland             38.95252
## 411                    Szeged, Hungary             37.83932
## 413                   Curitiba, Brazil             37.28064
## 414                 Timisoara, Romania             38.69028
## 417                      Suzhou, China             39.27982
## 418                Manila, Philippines             38.59029
## 419                   Istanbul, Turkey             38.18434
## 420          Ho Chi Minh City, Vietnam             38.57153
## 421                   Katowice, Poland             37.84372
## 422                   Szczecin, Poland             37.58042
## 424                    Tirana, Albania             37.41716
## 425                       Lodz, Poland             37.48019
## 426                    Brasov, Romania             37.12035
## 427 Banja Luka, Bosnia And Herzegovina             35.98841
## 428                      Iasi, Romania             36.89030
## 429                  Plovdiv, Bulgaria             36.20130
## 430                  Cebu, Philippines             35.93109
## 431              Yekaterinburg, Russia             36.49554
## 432                   Burgas, Bulgaria             35.90275
## 433                     Chengdu, China             36.37540
## 436                 Colombo, Sri Lanka             36.04821
## 437                     Samara, Russia             36.23845
## 439                Surabaya, Indonesia             35.60134
## 440                Casablanca, Morocco             36.59775
## 441                     Sibiu, Romania             35.60108
## 442                 Bandung, Indonesia             35.29545
## 446                   Bogota, Colombia             35.30284
## 447              Yogyakarta, Indonesia             35.05345
## 449                     Ankara, Turkey             34.48987
## 450                  Skopje, Macedonia             34.55490
## 451                    Oradea, Romania             34.06943
## 452                        Nis, Serbia             33.34527
## 453                       Tehran, Iran             35.79493
## 454                Mexico City, Mexico             35.99141
## 460                      Izmir, Turkey             33.85714
## 463                  Chisinau, Moldova             33.55206
## 464                      Bursa, Turkey             33.09792
## 465                      Kazan, Russia             33.93267
## 466                Novosibirsk, Russia             34.07051
## 467                 Davao, Philippines             33.27286
## 468                 Asuncion, Paraguay             33.01683
## 470                     Lagos, Nigeria             35.85992
## 472                   Yerevan, Armenia             32.86295
## 476                  Krasnodar, Russia             32.45217
## 477                   Kathmandu, Nepal             31.39274
## 478                   Craiova, Romania             31.34190
## 480           Quezon City, Philippines             31.05018
## 485                  Queretaro, Mexico             31.77539
## 487                     Cali, Colombia             30.44753
## 489                    Odessa, Ukraine             29.73155
## 494                     Merida, Mexico             28.67106
## 496                     Puebla, Mexico             28.13502
## 497                       Delhi, India             29.68644
## 499                    Dnipro, Ukraine             27.61716
## 500                 Caracas, Venezuela             28.74864
## 501                        Pune, India             27.93417
## 502                      Lviv, Ukraine             27.28263
## 503                    Ludhiana, India             26.35986
## 506                     Tunis, Tunisia             25.43594
## 508                  Chandigarh, India             26.04387
## 510                   Lahore, Pakistan             25.69624
## 512                      Jaipur, India             25.34751
## 513                      Indore, India             24.72951
## 518                         Goa, India             25.33686
## 519                   Ahmedabad, India             24.70326
## 520                  Alexandria, Egypt             23.54235
## 521                  Karachi, Pakistan             24.01317
## 522                      Sumy, Ukraine             21.85227
## 523                       Surat, India             23.02095
## 527                      Mysore, India             22.38407
## 528                 Bhubaneswar, India             22.34519
## 529                   Mangalore, India             22.48082
## 530                  Coimbatore, India             22.36722
## 531                      Bhopal, India             21.40214
## 532                    Vadodara, India             21.99751

Here we implement the idea of having two seperate datasets by splitting the data in train and test. This produces a bigger MSE and a bit less accuracy however it performs well at classifying unseen data with a cost of living and is still viable at classifying for cost of living each city. As this is a Random Forest algorithm, cross validation is unnecessary for overfitting problem due to the OOB error estimate as it is tested internally. We can also see from the commented out model that rent and local purchasing power were ineffective for the model so we decided to leave them out

Neural Net Analysis

Here we build our neural network to try and analyze the data. We build the model with the full dataset first here. We have to first normalize the data.

library(NeuralNetTools)
## Warning: package 'NeuralNetTools' was built under R version 3.4.4
library(neuralnet)
## Warning: package 'neuralnet' was built under R version 3.4.4
nums = unlist(lapply(data, is.numeric))  
dataNums = data[ , nums]
scar <- apply(dataNums, 2, function(v) (v-min(v))/(max(v)-min(v)))
ind <- sample(1:nrow(scar), 300)
train <- scar[ind, ]
test <- scar[-ind, ]
nn = neuralnet(Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data=scar, hidden=c(5,3), linear.output = TRUE)
nn$result.matrix
##                                                     [,1]
## error                                        0.020307853
## reached.threshold                            0.009143724
## steps                                      767.000000000
## Intercept.to.1layhid1                       -0.110891100
## Rank.to.1layhid1                             1.841907099
## Cost.of.Living.Plus.Rent.Index.to.1layhid1  -0.736582303
## Groceries.Index.to.1layhid1                 -1.484949063
## Restaurant.Price.Index.to.1layhid1           0.574919356
## Intercept.to.1layhid2                       -0.290268527
## Rank.to.1layhid2                             1.076804470
## Cost.of.Living.Plus.Rent.Index.to.1layhid2  -1.899135650
## Groceries.Index.to.1layhid2                 -1.557892751
## Restaurant.Price.Index.to.1layhid2          -1.244089645
## Intercept.to.1layhid3                        4.698671247
## Rank.to.1layhid3                             0.745957867
## Cost.of.Living.Plus.Rent.Index.to.1layhid3  -2.865393266
## Groceries.Index.to.1layhid3                 -6.172097642
## Restaurant.Price.Index.to.1layhid3          -3.005127313
## Intercept.to.1layhid4                       -2.288680551
## Rank.to.1layhid4                           -20.627020477
## Cost.of.Living.Plus.Rent.Index.to.1layhid4  -0.683558029
## Groceries.Index.to.1layhid4                  1.036948723
## Restaurant.Price.Index.to.1layhid4           1.755113581
## Intercept.to.1layhid5                       -0.894689628
## Rank.to.1layhid5                            -0.919745950
## Cost.of.Living.Plus.Rent.Index.to.1layhid5  -0.381917632
## Groceries.Index.to.1layhid5                  1.148948433
## Restaurant.Price.Index.to.1layhid5           1.424561188
## Intercept.to.2layhid1                        0.031033814
## 1layhid1.to.2layhid1                         1.845423760
## 1layhid2.to.2layhid1                         1.888443301
## 1layhid3.to.2layhid1                        -1.991515450
## 1layhid4.to.2layhid1                        -0.641293760
## 1layhid5.to.2layhid1                        -0.124361091
## Intercept.to.2layhid2                       -1.993918611
## 1layhid1.to.2layhid2                        -2.421733319
## 1layhid2.to.2layhid2                        -1.599396199
## 1layhid3.to.2layhid2                         0.186642670
## 1layhid4.to.2layhid2                         3.118298756
## 1layhid5.to.2layhid2                         1.500980215
## Intercept.to.2layhid3                        0.147514217
## 1layhid1.to.2layhid3                         0.433538961
## 1layhid2.to.2layhid3                         1.746232285
## 1layhid3.to.2layhid3                        -0.504038074
## 1layhid4.to.2layhid3                        -0.320427369
## 1layhid5.to.2layhid3                        -1.510386090
## Intercept.to.Cost.of.Living.Index            0.869978586
## 2layhid1.to.Cost.of.Living.Index            -0.209994841
## 2layhid2.to.Cost.of.Living.Index             0.843154780
## 2layhid3.to.Cost.of.Living.Index            -0.963293971
plot(nn)
summary(nn)
##                     Length Class      Mode    
## call                   5   -none-     call    
## response             536   -none-     numeric 
## covariate           2144   -none-     numeric 
## model.list             2   -none-     list    
## err.fct                1   -none-     function
## act.fct                1   -none-     function
## linear.output          1   -none-     logical 
## data                   7   data.frame list    
## exclude                0   -none-     NULL    
## net.result             1   -none-     list    
## weights                1   -none-     list    
## generalized.weights    1   -none-     list    
## startweights           1   -none-     list    
## result.matrix         50   -none-     numeric

We see a low error rate of .02964 from the neural network when using the full dataset to complete its task. This is quite respectable but we want to know if we are overfitting which is quite possible. Below we implement the same neural network but with a test and train seperation

Using test data for accuracy rate

nn2 = neuralnet(Cost.of.Living.Index ~ Rank + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index, data=train, hidden=c(5,3), linear.output = TRUE)
nn.results <- compute(nn2, test)
result <- nn.results$net.result
original_values <- max.col(scar)
results <- max.col(result)
mean(results == original_values)#accuracy rate
## Warning in results == original_values: longer object length is not a
## multiple of shorter object length
## [1] 0.4570896
sum((compute(nn2, test[,-2])$net.result-test[,2])^2)
## [1] 0.03471869

The result of accuracy now for the neural network is at almost 46%. This shows to be very low. We want to see if we can make this any better. Therefore we perform K-Fold CV on the neural net below to see if there is significantly better at building the neural network to get more accurate results

K-Fold - Neural Net

# 10 fold cross validation
k <- 10
# Results from cv
outs <- NULL
# Train test split proportions
proportion <- 0.95 # Set to 0.995 for LOOCV

for(i in 1:k)
{
    index <- sample(1:nrow(scar), round(proportion*nrow(scar)))
    train_cv <- scar[index, ]
    test_cv <- scar[-index, ]
    nn_cv <- neuralnet(Cost.of.Living.Index ~ Rank + Rent.Index + Cost.of.Living.Plus.Rent.Index + Groceries.Index + Restaurant.Price.Index + Local.Purchasing.Power.Index,
                        data = train,
                        hidden = c(13, 10, 3),
                        act.fct = "logistic",
                        linear.output = FALSE)
    
    # Compute predictions
    pr.nn <- compute(nn_cv, test)
    # Extract results
    pr.nn_ <- pr.nn$net.result
    # Accuracy (test set)
    original_values <- max.col(test)
    pr.nn_2 <- max.col(pr.nn_)
    outs[i] <- mean(pr.nn_2 == original_values)
}
outs
##  [1] 0.4491525 0.4491525 0.4491525 0.4491525 0.4491525 0.4491525 0.4491525
##  [8] 0.4491525 0.4491525 0.4491525
mean(outs)
## [1] 0.4491525

After performing the CV we realize that the neural network is about average of 47% accurate which is almost exactly of what we get above. Therefore this neural network would not be a very good choice to use to predict Cost of Living index